Network Working Group S. Nandakumar Internet-Draft C. Jennings Intended status: Informational Cisco Expires: July 7, 2017 January 3, 2017 SDP for the WebRTC draft-ietf-rtcweb-sdp-03 Abstract The Web Real-Time Communication [WebRTC] working group is charged to provide protocol support for direct interactive rich communication using audio, video and data between two peers' web browsers. With in the WebRTC framework, Session Description protocol (SDP) [RFC4566] is used for negotiating session capabilities between the peers. Such a negotiation happens based on the SDP Offer/Answer exchange mechanism described in [RFC3264]. This document provides an informational reference in describing the role of SDP and the Offer/Answer exchange mechanism for the most common WebRTC use-cases. This SDP examples provided in this document is still a work in progress, but it aims to align closest to the evolving standards work. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on July 7, 2017. Nandakumar & Jennings Expires July 7, 2017 [Page 1] Internet-Draft SDP4WebRTC January 2017 Copyright Notice Copyright (c) 2017 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. SDP and the WebRTC . . . . . . . . . . . . . . . . . . . . . 3 4. Offer/Answer and the WebRTC . . . . . . . . . . . . . . . . . 5 5. WebRTC Session Description Examples . . . . . . . . . . . . . 6 5.1. Some Conventions . . . . . . . . . . . . . . . . . . . . 7 5.2. Basic Examples . . . . . . . . . . . . . . . . . . . . . 9 5.2.1. Audio Only Session . . . . . . . . . . . . . . . . . 9 5.2.2. Audio/Video Session . . . . . . . . . . . . . . . . . 12 5.2.3. Data Only Session . . . . . . . . . . . . . . . . . . 17 5.2.4. Audio Call On Hold . . . . . . . . . . . . . . . . . 19 5.2.5. Audio with DTMF Session . . . . . . . . . . . . . . . 22 5.2.6. One Way Audio/Video Session - Document Camera . . . . 26 5.2.7. Audio, Video Session with BUNDLE Support Unknown . . 30 5.2.8. Audio, Video and Data Session . . . . . . . . . . . . 35 5.2.9. Audio, Video Session with BUNDLE Unsupported . . . . 40 5.2.10. Audio, Video BUNDLED, but Data (Not BUNDLED) . . . . 45 5.2.11. Audio Only, Add Video to BUNDLE . . . . . . . . . . . 50 5.3. MultiResolution, RTX, FEC Examples . . . . . . . . . . . 57 5.3.1. Sendonly Simulcast Session with 2 cameras and 2 encodings per camera . . . . . . . . . . . . . . 57 5.3.2. Successful SVC Video Session . . . . . . . . . . . . 64 5.3.3. Successful Simulcast Video Session with Retransmission . . . . . . . . . . . . . . . . . . . 69 5.3.4. Successful 1-way Simulcast Session with 2 resolutions and RTX - One resolution rejected . . . . . . 74 5.3.5. Simulcast Video Session with Forward Error Correction 79 5.4. Others . . . . . . . . . . . . . . . . . . . . . . . . . 84 5.4.1. Audio Session - Voice Activity Detection . . . . . . 84 5.4.2. Audio Conference - Voice Activity Detection . . . . . 87 5.4.3. Successful legacy Interop Fallback with bundle-only . 90 Nandakumar & Jennings Expires July 7, 2017 [Page 2] Internet-Draft SDP4WebRTC January 2017 5.4.4. Legacy Interop with RTP/AVP profile . . . . . . . . . 95 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 100 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 100 8. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . 100 9. Informative References . . . . . . . . . . . . . . . . . . . 102 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 107 1. Introduction Javascript Session Exchange Protocol(JSEP) [I-D.ietf-rtcweb-jsep] specifies a generic protocol needed to generate [RFC3264] Offers and Answers negotiated between the WebRTC peers for setting up, updating and tearing down a WebRTC session. For this purpose, SDP is used to construct [RFC3264] Offers/Answers for describing (media and non- media) streams as appropriate for the recipients of the session description to participate in the session. The remainder of this document is organized as follows: Sections 3 and 4 provides an overview of SDP and the Offer/Answer exchange mechanism. Section 5 provides sample SDP generated for the most common WebRTC use-cases. 2. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 3. SDP and the WebRTC The purpose of this section is to provide a general overview of SDP and its components. For a more in-depth understanding, the readers are advised to refer to [RFC4566]. The Session Description Protocol (SDP) [RFC4566] describes multimedia sessions, which can contain audio, video, whiteboard, fax, modem, and other streams. SDP provides a general purpose, standard representation to describe various aspects of multimedia session such as media capabilities, transport addresses and related metadata in a transport agnostic manner, for the purposes of session announcement, session invitation and parameter negotiation. As of today SDP is widely used in the context of Session Initiation Protocol [RFC3261], Real-time Transport Protocol [RFC3550] and Real- time Streaming Protocol applications [RFC2326]. Below figure introduces high-level breakup of SDP into components that semantically describe a multimedia session, in our case, a Nandakumar & Jennings Expires July 7, 2017 [Page 3] Internet-Draft SDP4WebRTC January 2017 WebRTC session [WebRTC]. It by no means captures everything about SDP and hence, should be used for informational purposes only. +---------------------+ | v= | +---------------------+ +---------------------+ +---------------------+ ==== | Session Metadata | ===== | o= | | +---------------------+ +---------------------- | +---------------------+ | | t= | | +---------------------+ | | | +---------------------+ | | c= | | +---------------------+ | +---------------------+ ==== | Network Description | ===== | +---------------------+ | +---------------------+ | | a=candidate | | +---------------------+ | | | +---------------------+ | | m= | | +---------------------+ | +---------------------+ +---------------------+ ==== | Stream Description | ===== | a=rtpmap | | +---------------------+ +---------------------- | +---------------------+ | | a=fmtp | | +---------------------+ | +---------------------+ | | a=sendrecv.. | | +---------------------+ +---------------+ | SEMANTIC | | COMPONENTS OF | | SDP | +---------------+ | +---------------------+ | | a=crypto | | +---------------------+ | +---------------------+ +---------------------+ ==== |Security Descriptions| =====| a=ice-frag | | +---------------------+ +---------------------- Nandakumar & Jennings Expires July 7, 2017 [Page 4] Internet-Draft SDP4WebRTC January 2017 | +---------------------+ | | a=ice-pwd | | +---------------------+ | +---------------------+ | | a=fingerprint | | +---------------------+ | | | | +---------------------+ | | a=rtcp-fb | | +---------------------+ | +---------------------+ +---------------------+ ==== | Qos,Grouping | | | | Descriptions | =====| a=group | +---------------------+ +---------------------- +---------------------+ | a=rtcpmux | +---------------------+ Figure 1: Semantic Components of SDP [WebRTC] proposes JavaScript application to fully specify and control the signaling plane of a multimedia session as described in the JSEP specification [I-D.ietf-rtcweb-jsep]. JSEP provides mechanisms to create session characterization and media definition information to conduct the session based on SDP exchanges. In this context, SDP serves two purposes: 1. Provide grammatical structure syntactically. 2. Semantically convey participant's intention and capabilities required to successfully negotiate a session. 4. Offer/Answer and the WebRTC This section introduces SDP Offer/Answer Exchange mechanism mandated by WebRTC for negotiating session capabilities while setting up, updating and tearing down a WebRTC session. This section is intentionally brief in nature and interested readers are recommended to refer [RFC3264] for specific details on the protocol operation. Nandakumar & Jennings Expires July 7, 2017 [Page 5] Internet-Draft SDP4WebRTC January 2017 The Offer/Answer [RFC3264] model specifies rule for the bilateral exchange of Session Description Protocol (SDP) messages for creation of multimedia streams. It defines protocol with involved participants exchanging desired session characteristics from each others perspective constructed as SDP to negotiate the session between them. In the most basic form,the protocol operation begins by one of the participants sending an initial SDP Offer describing its intent to start a multimedia communication session. The participant receiving the offer MAY generate an SDP Answer accepting the offer or it MAY reject the offer. If the session is accepted the Offer/Answer model guarantees a common view of the multimedia session between the participants. At any time, either participant MAY generate a new SDP offer that updates the session in progress. With in the context of WebRTC, the Offer/Answer model defines the state-machinery for WebRTC peers to negotiate session descriptions between them during the initial setup stages as well as for eventual session updates. Javascript Session Establishment Protocol specification [I-D.ietf-rtcweb-jsep] for WebRTC provides the mechanism for generating [RFC3264] SDP Offers and Answers in order for both sides of the session to agree upon details such as list of media formats to be sent/received, bandwidth information, crypto parameters, transport parameters, for example. 5. WebRTC Session Description Examples A typical web based real-time multimedia communication session can be characterized as below: o It has zero or more Audio only, Video only or Audio/Video RTP Sessions, o MAY contain zero or more non-media data sessions, o All the sessions are secured with DTLS-SRTP, o Supports NAT traversal using ICE mechanism, o Provides RTCP based feedback mechanisms, o Sessions can be over IPv4-only, IPv6-only, dual-stack based clients. Nandakumar & Jennings Expires July 7, 2017 [Page 6] Internet-Draft SDP4WebRTC January 2017 5.1. Some Conventions The examples given in this document follow the conventions listed below: o In all the examples, Alice and Bob are assumed to be the WebRTC peers. o It is assumed that for most of the examples, the support for [I-D.ietf-mmusic-sdp-bundle-negotiation] is established apriori either out-of-band or as a consequence of successful Offer/Answer negotiation between Alice and Bob, unless explicitly stated otherwise. o Call-flow diagrams that accompany the use-cases capture only the prominent aspects of the system behavior and intentionally is not detailed to improve readability. o Eventhough the call-flow diagrams shows SDP being exchanged between the parties, it doesn't represent the only way an WebRTC setup is expected to work. Other approaches may involve WebRTC applications to exchange the media setup information via non-SDP mechanisms as long as they confirm to the [I-D.ietf-rtcweb-jsep] API specification. o The SDP examples deviate from actual on-the-wire SDP notation in several ways. This is done to facilitate readability and to conform to the restrictions imposed by the RFC formatting rules. * Visual markers/Empty lines in any SDP example are inserted to make functional divisions in the SDP clearer, and are not actually part of the SDP syntax. * Any SDP line that is indented (compared to the initial line in the SDP block) is a continuation of the preceding line. The line break and indent are to be interpreted as a single space character. * Excepting the above two conventions, line endings are to be interpreted as pairs (that is, an ASCII 13 followed by an ASCII 10). o Against each SDP line, pointers to the appropriate RFCs are provided for further informational reference. Also an attempt has been made to provide explanatory notes to enable better understanding of the SDP usage, wherever appropriate. Nandakumar & Jennings Expires July 7, 2017 [Page 7] Internet-Draft SDP4WebRTC January 2017 o Following SDP details are common across all the use-cases defined in this document unless mentioned otherwise. * DTLS fingerprint for SRTP (a=fingerprint) * RTP/RTCP Multiplexing (a=rtcp-mux) * RTCP Feedback support (a=rtcp-fb) * Host and server-reflexive candidate lines (a=candidate) * SRTP Setup framework parameters (a=setup) * RTCP attribute (a=rtcp) * RTP header extension indicating audio-levels from client to the mixer For specific details, readers must refer to [I-D.ietf-rtcweb-jsep] specification. o The term "Session" is used rather loosely in this document to refer to either a "Communication Session" or a "RTP Session" or a "RTP Stream" depending on the context. o Payload type 109 is usually used for OPUS, 0 for PCMU, 8 for PCMA, 99 for H.264 and 120 for VP8 in most of the examples to maintain uniformity. o The IP Address:Port combinations '192.168.1.4:61665' (host) and '24.23.204.141:54609' (Server Reflexive) is typically used for Alice. o The IP Address:Port combinations '192.168.1.7:51556' (host) and '98.248.92.77:49203' (Server Reflexive) is typically used for Bob. o SSRC cname 'cname:EocUG1f0fcg/yvY7' applies to Alice and the cname 'cname:Q/NWs1ao1HmN4Xa5' corresponds to Bob. o The SSRCs values '12345', '56789' and '11111' till '66666' usually represent Alice's RTP Streams and the values '54321', '98765' and '77777' till '99999' represent Bob's RTP Streams. o In the actual use the values that represent SSRCs, ICE candidate foundations, WebRTC Mediastream and MediaStreamTrack Ids shall be much larger and/or random than the ones shown in the examples. Nandakumar & Jennings Expires July 7, 2017 [Page 8] Internet-Draft SDP4WebRTC January 2017 5.2. Basic Examples 5.2.1. Audio Only Session This common scenario shows SDP for secure two-way audio session with Alice offering Opus, PCMU, PCMA and Bob accepting all the offered audio codecs. 2-Way Audio Only Session Alice Bob | | | | | Offer(Audio:Opus,PCMU,PCMA) | |------------------------------------>| | | | | | Answer(Audio:Opus,PCMU,PCMA) | |<------------------------------------| | | | | |Two-way Opus Audio (preferred-codec) | |.....................................| | | | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 8 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:60065 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] - Alice can send | Nandakumar & Jennings Expires July 7, 2017 [Page 9] Internet-Draft SDP4WebRTC January 2017 | | and recv audio | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Opus Codec 48khz, 2 channels | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] - ICE password | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] - DTLS Fingerprint | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | for SRTP | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] - Alice can perform | | | RTP/RTCP Muxing | | a=rtcp-rsize | [RFC5506] - Alice intends to | | | use reduced size RTCP for | | | this session | | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] Alice supports RTP | | hdrext:ssrc-audio-level | header extension to indicate | | | audio levels | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] - Alice's audio | | cname:EocUG1f0fcg/yvY7 | stream SSRC. | | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP Host | | 192.168.1.4 61665 typ host | Candidate | | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP Server | | 24.23.204.141 54609 typ srflx | Reflexive ICE Candidate | | raddr 192.168.1.4 rport 61665 | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] - RTCP Host | | 192.168.1.4 61667 typ host | Candidate | | a=candidate:1 2 UDP 1685987071 | [RFC5245] - RTCP Server | | 24.23.204.141 60065 typ srflx | Reflexive ICE Candidate | | raddr 192.168.1.4 rport 61667 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 1: 5.2.1 SDP Offer +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ Nandakumar & Jennings Expires July 7, 2017 [Page 10] Internet-Draft SDP4WebRTC January 2017 | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 8 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] - Bob can send and | | | recv audio | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | | Opus Codec | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:05067423 | [RFC5245] - ICE user fragment | | a=ice-pwd:1747d1ee3474a28a397a4c3 | [RFC5245] - ICE password | | f3af08a068 | parameter | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] - DTLS Fingerprint | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | for SRTP | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] - Bob can perform | | | RTP/RTCP Muxing on port 49203 | | a=rtcp-rsize | [RFC5506] - Bob intends to | | | use reduced size RTCP for | | | this session | | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] Bob supports audio | | hdrext:ssrc-audio-level | level RTP header extension as | | | well | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] - Bob's audio | | cname:Q/NWs1ao1HmN4Xa5 | stream SSRC. | | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP/RTCP Host ICE | Nandakumar & Jennings Expires July 7, 2017 [Page 11] Internet-Draft SDP4WebRTC January 2017 | 192.168.1.7 51556 typ host | Candidate | | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP/RTCP Server | | 98.248.92.77 49203 typ srflx | Reflexive ICE Candidate | | raddr 192.168.1.7 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 2: 5.2.1 SDP Answer 5.2.2. Audio/Video Session Alice and Bob establish a two-way audio and video session with Opus as the audio codec and H.264 as the video codec. 2-Way Audio,Video Session Alice Bob | | | | |Offer(Audio:Opus,PCMU,PCMA Video:H.264,VP8) | |------------------------------------------->| | | | | | Answer(Audio:Opus,Video:H.264) | |<-------------------------------------------| | | | | | Two-way Opus Audio, H.264 Video | |............................................| | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 8 | | Nandakumar & Jennings Expires July 7, 2017 [Page 12] Internet-Draft SDP4WebRTC January 2017 | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] - Alice can send | | | and recv audio | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Opus Codec 48khz, 2 channels | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] - ICE password | | 74af08a068 | parameter | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] - DTLS Fingerprint | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | for SRTP | | :04 :BB:05:2F:70:9F:0 | | | 4:A9:0E:05:E9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] - Alice can perform | | | RTP/RTCP Muxing | | a=rtcp-rsize | [RFC5506] - Alice intends to | | | use reduced size RTCP for | | | this session | | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP/RTCP Host | | 192.168.1.4 61665 typ host | Candidate | | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP/RTCP Server | | 24.23.204.141 54609 typ srflx | Reflexive ICE Candidate | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 99 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | Nandakumar & Jennings Expires July 7, 2017 [Page 13] Internet-Draft SDP4WebRTC January 2017 | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendrecv | [RFC3264] - Alice can send | | | and recv video | | a=rtpmap:99 H264/90000 | [RFC3984] - H.264 Video Codec | | a=fmtp:99 profile-level-id=4d0028 | [RFC3984] | | ;packetization-mode=1 | | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] - VP8 | | | video codec | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] - DTLS Fingerprint | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | for SRTP | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] - Alice can perform | | | RTP/RTCP Muxing | | a=rtcp-rsize | [RFC5506] - Alice intends to | | | use reduced size RTCP for | | | this session | | a=rtcp-fb:99 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=rtcp-fb:99 nack pli | [RFC5104] - Indicates support | | | for Picture loss Indication | | | and NACK | | a=rtcp-fb:99 ccm fir | [RFC5104] - Full Intra Frame | | | Request-Codec Control Message | | | support | | a=rtcp-fb:120 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=rtcp-fb:120 nack pli | [RFC5104] - Indicates support | | | for Picture loss Indication | | | and NACK | | a=rtcp-fb:120 ccm fir | [RFC5104] - Full Intra Frame | | | Request-Codec Control Message | | | support | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:56789 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | +-----------------------------------+-------------------------------+ Table 3: 5.2.2 SDP Offer +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ Nandakumar & Jennings Expires July 7, 2017 [Page 14] Internet-Draft SDP4WebRTC January 2017 | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] - Bob can send and | | | recv audio | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Bob accepts only Opus Codec | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] - ICE username | | | frag | | a=ice-pwd:de4e99bd291c325921d5d47 | [RFC5245] - ICE password | | efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] - DTLS Fingerprint | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | for SRTP | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] - Bob can perform | | | RTP/RTCP Muxing | | a=rtcp-rsize | [RFC5506] - Bob intends to | | | use reduced size RTCP for | | | this session | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 3618095783 | [RFC5245] - RTP/RTCP Host ICE | | 192.168.1.7 49203 typ host | Candidate | | a=candidate:1 1 UDP 565689203 | [RFC5245] - RTP/RTCP Server | | 98.248.92.77 49203 typ srflx | Reflexive ICE Candidate | | raddr 192.168.1.7 rport 51556 | | Nandakumar & Jennings Expires July 7, 2017 [Page 15] Internet-Draft SDP4WebRTC January 2017 | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 99 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendrecv | [RFC3264] - Bob can send and | | | recv video | | a=rtpmap:99 H264/90000 | [RFC3984] - Bob accepts H.264 | | | Video Codec. | | a=fmtp:99 profile-level-id=4d0028 | [RFC3984] | | ;packetization-mode=1 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] - DTLS Fingerprint | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | for SRTP | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] - Bob can perform | | | RTP/RTCP Muxing | | a=rtcp-rsize | [RFC5506] - Bob intends to | | | use reduced size RTCP for | | | this session | | a=rtcp-fb:99 nack | [RFC5104] - Indicates support | | | for NACK based RTCP feedback | | a=rtcp-fb:99 nack pli | [RFC5104] - Indicates support | | | for Picture loss Indication | | | and NACK | | a=rtcp-fb:99 ccm fir | [RFC5104] - Full Intra Frame | | | Request- Codec Control | | | Message support | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:98765 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | +-----------------------------------+-------------------------------+ Table 4: 5.2.2 SDP Answer Nandakumar & Jennings Expires July 7, 2017 [Page 16] Internet-Draft SDP4WebRTC January 2017 5.2.3. Data Only Session This scenario illustrates SDP negotiated to setup a data-only session based on SCTP Data Channel, thus enabling use-cases such as file- transfer for example. 2-Way DataChannel Session Alice Bob | | | | | | | Offer(DataChannel) | |-------------------------------->| | | | | | Answer(DataChannel) | |<--------------------------------| | | | | | Two-way SCTP based DataChannel | |.................................| | | | | Nandakumar & Jennings Expires July 7, 2017 [Page 17] Internet-Draft SDP4WebRTC January 2017 +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE data | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Application m=line | ***************************** | | ********* | | | m=application 54609 UDP/DTLS/SCTP | [I-D.ietf-rtcweb-data-channel | | webrtc-datachannel | ] | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:data | [RFC5888] | | a=sendrecv | [RFC3264] - Alice can send | | | and recv non-media data | | a=sctp-port:5000 | [I-D.ietf-mmusic-sctp-sdp] | | a=max-message-size:100000 | [I-D.ietf-mmusic-sctp-sdp] | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=connection:new | [RFC4145] | | a=ice-ufrag:074c6550 | [RFC5245] - Session Level ICE | | | parameter | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] - Session Level ICE | | 74af08a068 | parameter | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] - Session DTLS | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | Fingerprint for SRTP | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 5: 5.2.3 SDP Offer Nandakumar & Jennings Expires July 7, 2017 [Page 18] Internet-Draft SDP4WebRTC January 2017 +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE data | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | ****** Application m=line | ***************************** | | ********* | | | m=application 49203 UDP/DTLS/SCTP | [I-D.ietf-mmusic-sctp-sdp] | | webrtc-datachannel | | | c=IN IP4 98.248.92.771 | [RFC4566] | | a=mid:data | [RFC5888] | | a=sendrecv | [RFC3264] - Bob can send and | | | recv non-media data | | a=sctp-port:5000 | [I-D.ietf-mmusic-sctp-sdp] | | a=max-message-size:100000 | [I-D.ietf-mmusic-sctp-sdp] | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=ice-ufrag:c300d85b | [RFC5245] - Session Level ICE | | | username frag | | a=ice-pwd:de4e99bd291c325921d5d47 | [RFC5245] - Session Level ICE | | efbabd9a2 | password | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] - Session DTLS | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | Fingerprint for SRTP | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 6: 5.2.3 SDP Answer 5.2.4. Audio Call On Hold Alice calls Bob, but when Bob answers he places Alice on hold by setting the SDP direction attribute to a=inactive in the Answer. Nandakumar & Jennings Expires July 7, 2017 [Page 19] Internet-Draft SDP4WebRTC January 2017 Audio On Hold Alice Bob | | | | | Offer(Audio:Opus) | |-------------------------------->| | | | | | Answer(Audio:Opus,a=inactive) | |<--------------------------------| | | | | | One-way Opus Audio | |.................................| | | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] - Alice can send | | | and recv audio | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Opus Codec 48khz, 2 channels | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] - ICE user | | | fragment | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] - ICE password | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] - DTLS Fingerprint | Nandakumar & Jennings Expires July 7, 2017 [Page 20] Internet-Draft SDP4WebRTC January 2017 | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | for SRTP | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] - Alice can perform | | | RTP/RTCP Muxing | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 7: 5.2.4 SDP Offer +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=inactive | [RFC3264] - Bob puts call On | | | Hold | Nandakumar & Jennings Expires July 7, 2017 [Page 21] Internet-Draft SDP4WebRTC January 2017 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Bob accepts Opus Codec | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] - ICE username frag | | a=ice-pwd:de4e99bd291c325921d5d47 | [RFC5245] - ICE password | | efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] - DTLS Fingerprint | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | for SRTP | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] - Bob can perform | | | RTP/RTCP Muxing | | a=rtcp-rsize | [RFC5506] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] - Host candidate | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] - Server Reflexive | | 24.23.204.141 49203 typ srflx | candidate | | raddr 192.168.1.7 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 8: 5.2.4 SDP Answer 5.2.5. Audio with DTMF Session In this example, Alice wishes to establish two separate audio streams, one for normal audio and the other for telephone-events. Alice offers first audio stream with three codecs and the other with [RFC2833] tones (for DTMF). Bob accepts both the audio streams by choosing Opus as the audio codec and telephone-event for the other stream. Nandakumar & Jennings Expires July 7, 2017 [Page 22] Internet-Draft SDP4WebRTC January 2017 Audio Session with DTMF Alice Bob | | | | | | | Offer(Audio:Opus,PCMU,PCMA Audio:telephone-event)| |-------------------------------------------------->| | | | | | Answer(Audio:Opus, Audio:telephone-event) | |<--------------------------------------------------| | | | | | Opus audio stream and telephone-event stream | |...................................................| | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio dtmf | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 8 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] - Alice can send | | | and recv audio | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Opus Codec 48khz, 2 channels | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] - ICE user | | | fragment | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] - ICE password | Nandakumar & Jennings Expires July 7, 2017 [Page 23] Internet-Draft SDP4WebRTC January 2017 | 74af08a068 | parameter | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] - DTLS Fingerprint | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | for SRTP | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] - Alice can perform | | | RTP/RTCP Muxing | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** DTMF m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 126 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:dtmf | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendonly | [RFC3264] - Alice can send | | | DTMF Events | | a=rtpmap:126 telephone-event/8000 | [RFC2833] | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] - DTLS Fingerprint | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | for SRTP | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | | | RTCP feedback support | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | Nandakumar & Jennings Expires July 7, 2017 [Page 24] Internet-Draft SDP4WebRTC January 2017 | a=ssrc:56789 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | +-----------------------------------+-------------------------------+ Table 9: 5.2.5 SDP Offer +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio dtmf | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] - Bob can send and | | | receive Opus audio | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Bob accepts Opus Codec | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] - ICE username | | | frag | | a=ice-pwd:de4e99bd291c325921d5d47 | [RFC5245] - ICE password | | efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] - Fingerprint for | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | SRTP | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] - Bob can perform | | | RTP/RTCP Muxing on port 49203 | | a=rtcp-rsize | [RFC5506] - Alice intends to | | | use reduced size RTCP for | | | this session | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | Nandakumar & Jennings Expires July 7, 2017 [Page 25] Internet-Draft SDP4WebRTC January 2017 | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** DTMF m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 126 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:dtmf | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=recvonly | [RFC3264] - Alice can receive | | | DTMF events | | a=rtpmap:126 telephone-event/8000 | [RFC2833] | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] - Fingerprint for | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | SRTP | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] - Bob intends to | | | use reduced size RTCP for | | | this session | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:98765 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | +-----------------------------------+-------------------------------+ Table 10: 5.2.5 SDP Answer 5.2.6. One Way Audio/Video Session - Document Camera In this scenario Alice and Bob engage in a 1 way audio and video session with Bob receiving Alice's audio and her presentation slides as video stream. Nandakumar & Jennings Expires July 7, 2017 [Page 26] Internet-Draft SDP4WebRTC January 2017 One Way Audio & Video Session - Document Camera Alice Bob | | | | | | | Alice Offers sendonly audio and video streams. | | The video stream corresponds to her presentation | | | | Offer(Audio:Opus, Video: VP8) | |----------------------------------------------------->| | | | | | (Audio:Opus, Video: VP8) | |<-----------------------------------------------------| | | | | | One-way Opus Audio, VP8 Video | |......................................................| | Bob can hear Alice and see her presentation slides.| | | | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendonly | [RFC3264] - Send only audio | | | stream | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | Nandakumar & Jennings Expires July 7, 2017 [Page 27] Internet-Draft SDP4WebRTC January 2017 | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 24.23.204.141 54609 typ host | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendonly | [RFC3264] - Send only video | | | stream | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=content:slides | [RFC4796] -Alice's | | | presentation video stream | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | Nandakumar & Jennings Expires July 7, 2017 [Page 28] Internet-Draft SDP4WebRTC January 2017 | a=ssrc:56789 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | +-----------------------------------+-------------------------------+ Table 11: 5.2.6 SDP Offer +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=recvonly | [RFC3264] - Receive only | | | audio stream | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47 | [RFC5245] | | efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | Nandakumar & Jennings Expires July 7, 2017 [Page 29] Internet-Draft SDP4WebRTC January 2017 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 98.248.92.77 49203 typ host | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=recvonly | [RFC3264] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=content:slides | [RFC4796]presentation stream | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:98765 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | +-----------------------------------+-------------------------------+ Table 12: 5.2.6 SDP Answer 5.2.7. Audio, Video Session with BUNDLE Support Unknown In this example, since Alice is unsure of the Bob's support of the BUNDLE framework, following steps are performed in order to negotiate and setup a BUNDLE Address for the session o An SDP Offer, in which the Alice assigns unique addresses to each "m=" line in the BUNDLE group, and requests the Answerer to select the Offerer's BUNDLE address. o An SDP Answer, in which the Bob indicates its support for BUNDLE, selects the offerer's BUNDLE address, selects its own BUNDLE address and associates it with each BUNDLED m=line within the BUNDLE group. Nandakumar & Jennings Expires July 7, 2017 [Page 30] Internet-Draft SDP4WebRTC January 2017 Once the Offer/Answer exchange completes, both Alice and Bob each end up using single RTP Session for both the Media Streams. Two-Way Secure Audio,Video with BUNDLE support unknown Alice Bob | | | | | Alice offers BUNDLE support with unique address | | for the audio and video m-line | | | | | | Offer(Audio:Opus Video:VP8) | |----------------------------------------------------->| | |Bob | |supports | |BUNDLE, | |Uses | |identical | |address | Answer(Audio:Opus Video:VP8) | |<-----------------------------------------------------| | | | 2 Way Call with Audio and Video Multiplexed | |......................................................| | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54610 IN IP4 24.23.204.141 | [RFC3605] - RTCP port | | | different from RTP Port | Nandakumar & Jennings Expires July 7, 2017 [Page 31] Internet-Draft SDP4WebRTC January 2017 | a=mid:audio | [RFC5888] Audio m=line part | | | of BUNDLE group with a unique | | | port number | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP host | | 192.168.1.4 61665 typ host | candidate | | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP Server | | 24.23.204.141 54609 typ srflx | Reflexive candidate | | raddr 192.168.1.4 rport 61665 | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] - RTCP host | | 192.168.1.4 61666 typ host | candidate | | a=candidate:1 2 UDP 1685987071 | [RFC5245] - RTCP Server | | 24.23.204.141 54610 typ srflx | Reflexive candidate | | raddr 192.168.1.4 rport 61666 | | | ****** Video m=line ********* | ***************************** | | m=video 62537 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:62538 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:video | [RFC5888] Video m=line part | | | of the Bundle group with a | | | unique port number | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | Nandakumar & Jennings Expires July 7, 2017 [Page 32] Internet-Draft SDP4WebRTC January 2017 | a=sendrecv | [RFC3264] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=ice-ufrag:6550074c | [RFC5245] | | a=ice-pwd:74af08a068a28a397a4c3f3 | [RFC5245] | | 1747d1ee34 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:56789 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP Host | | 192.168.1.4 61886 typ host | candidate | | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP Server | | 24.23.204.141 62537 typ srflx | Reflexive candidate | | raddr 192.168.1.4 rport 61886 | | | a=candidate:0 2 2122194687 | [RFC5245] - RTCP host | | 192.168.1.4 61888 typ host | candidate | | a=candidate:1 2 UDP 1685987071 | [RFC5245] - RTCP Server | | 24.23.204.141 62538 typ srflx | Reflexive candidate | | raddr 192.168.1.4 rport 61888 | | +-----------------------------------+-------------------------------+ Table 13: 5.2.7 SDP Offer w/BUNDLE +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] Bob supports | | | BUNDLE semantics. | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | Nandakumar & Jennings Expires July 7, 2017 [Page 33] Internet-Draft SDP4WebRTC January 2017 | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:audio | [RFC5888] Audio m=line part | | | of the BUNDLE group | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47 | [RFC5245] | | efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 51556 typ srflx | | | raddr 192.168.1.7 rport 49203 | | | ****** Video m=line ********* | ***************************** | | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:video | [RFC5888] Video m=line part | | | of the BUNDLE group with the | | | port from audio line repeated | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendrecv | [RFC3264] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | Nandakumar & Jennings Expires July 7, 2017 [Page 34] Internet-Draft SDP4WebRTC January 2017 | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] - Bob carries out | | | DTLS Handshake in parallel | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:98765 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | +-----------------------------------+-------------------------------+ Table 14: 5.2.7 SDP Answer w/BUNDLE 5.2.8. Audio, Video and Data Session This example shows SDP for negotiating a session with Audio, Video and data streams between Alice and Bob with BUNDLE support known. Nandakumar & Jennings Expires July 7, 2017 [Page 35] Internet-Draft SDP4WebRTC January 2017 Audio,Video,Data with BUNDLE support known Alice Bob | | | | | Alice indicates BUNDLE support with | | identical address across all the m=lines | | | | | | Offer(Audio:Opus Video:VP8 Data) | |------------------------------------------->| | |Bob does | |the same | Answer(Audio:Opus,Video:VP8 Data) | |<-------------------------------------------| | | | | | | | Two-way Audio,Video, Data multiplexed | |............................................| | | | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video data | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=mid:audio | [RFC5888] | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | Nandakumar & Jennings Expires July 7, 2017 [Page 36] Internet-Draft SDP4WebRTC January 2017 | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendrecv | [RFC3264] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:56789 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | ****** Application m=line | ***************************** | | ********* | | Nandakumar & Jennings Expires July 7, 2017 [Page 37] Internet-Draft SDP4WebRTC January 2017 | m=application 54609 UDP/DTLS/SCTP | [I-D.ietf-rtcweb-data-channel | | webrtc-datachannel | ] | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=mid:data | [RFC5888] | | a=sctp-port:5000 | [I-D.ietf-mmusic-sctp-sdp] | | a=max-message-size:100000 | [I-D.ietf-mmusic-sctp-sdp] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=connection:new | [RFC4145] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | +-----------------------------------+-------------------------------+ Table 15: 5.2.8 SDP Offer +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video data | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=mid:audio | [RFC5888] | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47 | [RFC5245] | | efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | Nandakumar & Jennings Expires July 7, 2017 [Page 38] Internet-Draft SDP4WebRTC January 2017 | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendrecv | [RFC3264] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:98765 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | ****** Application m=line | ***************************** | | ********* | | | m=application 49203 UDP/DTLS/SCTP | [I-D.ietf-mmusic-sctp-sdp] | | webrtc-datachannel | | Nandakumar & Jennings Expires July 7, 2017 [Page 39] Internet-Draft SDP4WebRTC January 2017 | c=IN IP4 98.248.92.771 | [RFC4566] | | a=mid:data | [RFC5888] | | a=sctp-port:5000 | [I-D.ietf-mmusic-sctp-sdp] | | a=max-message-size:100000 | [I-D.ietf-mmusic-sctp-sdp] | | a=setup:active | [RFC4145] | | a=sendrecv | [RFC3264] | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | +-----------------------------------+-------------------------------+ Table 16: 5.2.8 SDP Answer 5.2.9. Audio, Video Session with BUNDLE Unsupported This use-case illustrates SDP Offer/Answer exchange where the far-end (Bob) either doesn't support media bundling or doesn't want to group m=lines over a single 5-tuple. The same is indicated by dropping the "a=group:BUNDLE" line and BUNDLE RTP header extension in the Answer SDP. On successful Offer/Answer exchange, Alice and Bob each end up using unique 5-tuple for audio and video media streams respectively. Nandakumar & Jennings Expires July 7, 2017 [Page 40] Internet-Draft SDP4WebRTC January 2017 Two-Way Secure Audio,Video with BUNDLE Unsupported Alice Bob | | | | | Alice offers BUNDLE support with unique address | | for the audio and video m-line | | | | | | Offer(Audio:Opus Video:VP8) | |----------------------------------------------------->| | |Bob | |doesn't | |support | |BUNDLE | Answer(Audio:Opus Video:VP8) | |<-----------------------------------------------------| | |Bob uses | |unique | |addresses | |across the | |m=lines | | |2Way Call with Audio and Video on different 5-tuples | |......................................................| | | | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:55232 IN IP4 24.23.204.141 | [RFC3605] - RTCP port | | | different from RTP port | | a=mid:audio | [RFC5888] Audio m=line part | Nandakumar & Jennings Expires July 7, 2017 [Page 41] Internet-Draft SDP4WebRTC January 2017 | | of BUNDLE group with a unique | | | port number | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] | | 192.168.1.4 61666 typ host | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 24.23.204.141 55232 typ srflx | | | raddr 192.168.1.4 rport 61666 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 54332 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:60052 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:video | [RFC5888] Video m=line part | | | of the BUNDLE group with a | | | unique port number | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | Nandakumar & Jennings Expires July 7, 2017 [Page 42] Internet-Draft SDP4WebRTC January 2017 | a=sendrecv | [RFC3264] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=ice-ufrag:7872093 | [RFC5245] | | a=ice-pwd:ee3474af08a068a28a397a4 | [RFC5245] | | c3f31747d1 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] - Alice can perform | | | DTLS before Answer arrives | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:56789 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.4 71775 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 24.23.204.141 54332 typ srflx | | | raddr 192.168.1.4 rport 71775 | | | a=candidate:0 2 2122194687 | [RFC5245] | | 192.168.1.4 71776 typ host | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 24.23.204.141 60052 typ srflx | | | raddr 192.168.1.4 rport 71776 | | +-----------------------------------+-------------------------------+ Table 17: 5.2.9 SDP Offer w/BUNDLE +----------------------------------------+--------------------------+ | Answer SDP Contents | RFC#/Notes | +----------------------------------------+--------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle | | | -ice] | | ****** Audio m=line ********* | ************************ | | | ***** | | m=audio 53214 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | | c=IN IP4 98.248.92.77 | [RFC4566] | Nandakumar & Jennings Expires July 7, 2017 [Page 43] Internet-Draft SDP4WebRTC January 2017 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | | a=msid:ma ta | Identifies | | | RTCMediaStream ID (ma) | | | and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-op | | | us] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice- | [RFC5245] | | pwd:de4e99bd291c325921d5d47efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65:5F:7 | [RFC5245] | | 8:E2:51:3B:AC:6F:F3:3F:46:1B:35 :DC:B8 | | | :5F:64:1A:24:C2:43:F0:A1:58:D0:A1:2C:1 | | | 9:08 | | | a=setup:active | [RFC4145] - Bob carries | | | out DTLS Handshake in | | | parallel | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp-hdrext | [RFC6464] | | :ssrc-audio-level | | | a=ssrc:54321 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 53214 typ srflx raddr | | | 192.168.1.7 rport 51556 | | | a=candidate:0 2 UDP 2122194687 | [RFC5245] | | 192.168.1.7 51558 typ host | | | a=candidate:1 2 UDP 1685987071 | [RFC5245] | | 98.248.92.77 60065 typ srflx raddr | | | 192.168.1.7 rport 51558 | | | ****** Video m=line ********* | ************************ | | | ***** | | m=video 58679 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:56507 IN IP4 98.248.92.77 | [RFC3605] | | a=msid:ma tb | Identifies | | | RTCMediaStream ID (ma) | | | and RTCMediaStreamTrack | | | ID (tb) | | a=sendrecv | [RFC3264] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=ice-ufrag:85bC300 | [RFC5245] | | a=ice- | [RFC5245] | | pwd:325921d5d47efbabd9a2de4e99bd291c | | Nandakumar & Jennings Expires July 7, 2017 [Page 44] Internet-Draft SDP4WebRTC January 2017 | a=fingerprint:sha-256 6B:8B:F0:65:5F:7 | [RFC5245] | | 8:E2:51:3B:AC:6F:F3:3F:46:1B:35 :DC:B8 | | | :5F:64:1A:24:C2:43:F0:A1:58:D0:A1:2C:1 | | | 9:08 | | | a=setup:active | [RFC4145] - Bob carries | | | out DTLS Handshake in | | | parallel | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=ssrc:98765 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 61556 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 58679 typ srflx raddr | | | 192.168.1.7 rport 61556 | | | a=candidate:0 1 UDP 2122194687 | [RFC5245] | | 192.168.1.7 61558 typ host | | | a=candidate:1 1 UDP 1685987071 | [RFC5245] | | 98.248.92.77 56507 typ srflx raddr | | | 192.168.1.7 rport 61558 | | +----------------------------------------+--------------------------+ Table 18: 5.2.9 SDP Answer without BUNDLE 5.2.10. Audio, Video BUNDLED, but Data (Not BUNDLED) This example show-cases SDP for negotiating a session with Audio, Video and data streams between Alice and Bob with data stream not being part of the BUNDLE group. This is shown by assigning unique port for data media section and not adding the "mid" identification tag to the BUNDLE group. Nandakumar & Jennings Expires July 7, 2017 [Page 45] Internet-Draft SDP4WebRTC January 2017 Audio, Video, with Data (Not in BUNDLE) Alice Bob | | | | |Alice wants to multiplex audio, video but not data | | | | | | Offer(Audio:Opus Video:VP8, Data(not in BUNDLE)) | |----------------------------------------------------->| | | | | | Answer(Audio:Opus Video:VP8, Data) | |<-----------------------------------------------------| | | | | |2 Way Call with Audio, Video Multiplexed except data | |......................................................| | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] Alice wants to | | | BUNDLE only audio and video | | | media. | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | Nandakumar & Jennings Expires July 7, 2017 [Page 46] Internet-Draft SDP4WebRTC January 2017 | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendrecv | [RFC3264] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:56789 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | ****** Application m=line | ***************************** | | ********* | | | m=application 10000 UDP/DTLS/SCTP | [I-D.ietf-rtcweb-data-channel | | webrtc-datachannel | ] | | c=IN IP4 24.23.204.141 | [RFC4566] | Nandakumar & Jennings Expires July 7, 2017 [Page 47] Internet-Draft SDP4WebRTC January 2017 | a=mid:data | [RFC5888] | | a=sctp-port:5000 | [I-D.ietf-mmusic-sctp-sdp] | | a=max-message-size:100000 | [I-D.ietf-mmusic-sctp-sdp] | | a=sendrecv | [RFC3264] | | a=setup:actpass | [RFC4145] | | a=connection:new | [RFC4145] | | a=ice-ufrag:89819013 | [RFC5245] | | a=ice-pwd:1747d1ee3474af08a068a28 | [RFC5245] | | a397a4c3f3 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 10000 typ host | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 19: 5.2.10 SDP Offer +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47 | [RFC5245] | | efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | Nandakumar & Jennings Expires July 7, 2017 [Page 48] Internet-Draft SDP4WebRTC January 2017 | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 98.248.92.771 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendrecv | [RFC3264] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:98765 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | ****** Application m=line | ***************************** | | ********* | | | m=application 20000 UDP/DTLS/SCTP | [I-D.ietf-mmusic-sctp-sdp] | | webrtc-datachannel | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=mid:data | [RFC5888] | | a=sctp-port:5000 | [I-D.ietf-mmusic-sctp-sdp] | Nandakumar & Jennings Expires July 7, 2017 [Page 49] Internet-Draft SDP4WebRTC January 2017 | a=max-message-size:100000 | [I-D.ietf-mmusic-sctp-sdp] | | a=setup:active | [RFC4145] | | a=sendrecv | [RFC3264] | | a=ice-ufrag:991Ca2a5e | [RFC5245] | | a=ice-pwd:921d5d47efbabd9a2de4e99 | [RFC5245] | | bd291c325 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 20000 typ host | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 20: 5.2.10 SDP Answer 5.2.11. Audio Only, Add Video to BUNDLE This example involves 2 Offer/Answer exchanges. First one is used to negotiate and setup BUNDLE support for Audio-only session followed by an updated Offer/Answer exchange to add video stream to the ongoing session. Also the newly added video stream is BUNDLED with the audio stream. Nandakumar & Jennings Expires July 7, 2017 [Page 50] Internet-Draft SDP4WebRTC January 2017 Audio Only , Add Video and BUNDLE Alice Bob | | | | | Alice indicates support for BUNDLE | | | | Offer(Audio:Opus) | |----------------------------------------------------->| | |Bob | |supports | |BUNDLE | Answer(Audio:Opus) | |<-----------------------------------------------------| | |Alice adds | |video stream | Updated Offer(Audio:Opus, Video:VP8) |to BUNDLE |----------------------------------------------------->| | | | |Bob accepts | Updated Answer(Audio:Opus, Video:VP8) | |<-----------------------------------------------------| | | | 2Way Call with Audio and Video Multiplexed | |......................................................| | | | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] Alice adds audio | | | m=line to the BUNDLE group | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | Nandakumar & Jennings Expires July 7, 2017 [Page 51] Internet-Draft SDP4WebRTC January 2017 | | ID (ta) | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 21: 5.2.11 SDP Offer +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | Nandakumar & Jennings Expires July 7, 2017 [Page 52] Internet-Draft SDP4WebRTC January 2017 | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47 | [RFC5245] | | efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 22: 5.2.10 SDP Answer +-----------------------------------+-------------------------------+ | Updated Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=1 | Version number incremented | | | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | Nandakumar & Jennings Expires July 7, 2017 [Page 53] Internet-Draft SDP4WebRTC January 2017 | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendrecv | [RFC3264] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | Nandakumar & Jennings Expires July 7, 2017 [Page 54] Internet-Draft SDP4WebRTC January 2017 | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:56789 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | +-----------------------------------+-------------------------------+ Table 23: 5.2.11 SDP Updated Offer +-----------------------------------+-------------------------------+ | Updated Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=1 | [RFC4566] Version number | | | incremented | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47 | [RFC5245] | | efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | Nandakumar & Jennings Expires July 7, 2017 [Page 55] Internet-Draft SDP4WebRTC January 2017 | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 120 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:video | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendrecv | [RFC3264] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:120 nack | [RFC5104] | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:98765 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | +-----------------------------------+-------------------------------+ Table 24: 5.2.11 SDP Updated Answer Nandakumar & Jennings Expires July 7, 2017 [Page 56] Internet-Draft SDP4WebRTC January 2017 5.3. MultiResolution, RTX, FEC Examples This section deals with scenarios related to multi-source, multi- stream negotiation such as layered coding, simulcast, along with techniques that deal with providing robustness against transmission errors such as FEC and RTX. Also to note, mechanisms such as FEC and RTX could be envisioned in the above basic scenarios as well. 5.3.1. Sendonly Simulcast Session with 2 cameras and 2 encodings per camera The SDP below shows Offer/Answer exchange with one audio and two video sources. Each of the video source can be sent at two different resolutions. One video source corresponds to VP8 encoding, while the other corresponds to H.264 encoding. [I-D.ietf-mmusic-rid] framework is used to further constrain the media format encodings and map the payload types (PT) to the 'rid' identifiers. [I-D.ietf-mmusic-sdp-simulcast] framework identifies the simulcast streams via their 'rid' identifiers. bundle-only attribute is used for the video sources in the Offer to ensure enabling video sources in the context of BUNDLE alone. BUNDLE grouping framework enables multiplexing of all the 5 streams (1 audio stream + 4 video streams) over a single RTP Session. Nandakumar & Jennings Expires July 7, 2017 [Page 57] Internet-Draft SDP4WebRTC January 2017 1 Way Successful Simulcast w/BUNDLE Alice Bob | | | | | Alice offers 2 sendonly video sources | | with 2 simulcast encodings per source | | and bundle-only for video | | | | | | Offer(Audio:Opus,Video1:VP8,Video2:H.264) | |------------------------------------------------>| | | | | | Answer(Audio:Opus Video1:VP8,Video2:H.264) | |<------------------------------------------------| | | |One-Way 1 Opus, 2 H.264 and 2 VP8 video streams, | | all multiplexed | |.................................................| | | | | +-------------------------------------+-----------------------------+ | Offer SDP Contents | RFC#/Notes | +-------------------------------------+-----------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE m0 m1 m2 | [I-D.ietf-mmusic-sdp-bundle | | | -negotiation] Alice | | | supports grouping of | | | m=lines under BUNDLE | | | semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ic | | | e] | | ****** Audio m=line ********* | *************************** | | | ** | | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m0 | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (ta) | Nandakumar & Jennings Expires July 7, 2017 [Page 58] Internet-Draft SDP4WebRTC January 2017 | a=sendonly | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3474 | [RFC5245] | | af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B:4 | [RFC5245] | | B:9F:81:E6:B8:5C:F4:A5:A8:D8:73:04 | | | :BB:05:2F:70:9F:04:A9:0E:05:E9:26:3 | | | 3:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle | | hdrext:sdes:mid | -negotiation] | | a=ssrc:11111 cname:EocUG1f0fcg/yvY7 | [RFC5576] | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx raddr | | | 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ic | | | e] | | ****** Video-1 m=line ********* | *************************** | | | ** | | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | bundle-only video line with | | | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=bundle-only | [I-D.ietf-mmusic-sdp-bundle | | | -negotiation] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=msid:ma tb | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (tb) | | a=sendonly | [RFC3264] - Send only video | | | stream | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fmtp:98 max-fr=30 | [RFC4566] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fmtp:100 max-fr=15 | [RFC4566] | | a=fingerprint:sha-256 19:E2:1C:3B:4 | [RFC5245] | | B:9F:81:E6:B8:5C:F4:A5:A8:D8:73:04 | | | :BB:05:2F:70:9F:04:A9:0E:05:E9:26:3 | | Nandakumar & Jennings Expires July 7, 2017 [Page 59] Internet-Draft SDP4WebRTC January 2017 | 3:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-mux-only | [I-D.ietf-mmusic-mux-exclus | | | ive] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle | | hdrext:sdes:mid | -negotiation] | | a=ssrc:22222 cname:EocUG1f0fcg/yvY7 | [RFC5576] [RFC7022] | | | Camera-1,Encoding-1 SSRC | | | with Session CNAME | | a=ssrc:33333 cname:EocUG1f0fcg/yvY7 | [RFC5576] [RFC7022] | | | Camera-1,Encoding-2 SSRC | | | with Session CNAME | | a=rid:1 send pt=98;max-width=1280 | [I-D.ietf-mmusic-rid] 1:1 | | ;max-height=720; | rid mapping to payload type | | | and specify resolution | | | constraints | | a=rid:2 send pt=100;max-width=640 | [I-D.ietf-mmusic-rid] 1:1 | | ;max-height=480; | rid mapping to payload type | | | and specify resolution | | | constraints | | a=simulcast: send 1;~2 | [I-D.ietf-mmusic-sdp-simulc | | | ast] Alice can send 2 | | | resolutions identified by | | | the 'rid' identifiers Also, | | | the second stream is | | | initially paused. | | ****** Video-2 m=line ********* | *************************** | | | ** | | m=video 0 UDP/TLS/RTP/SAVPF 101 102 | bundle-only video line with | | | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=bundle-only | [I-D.ietf-mmusic-sdp-bundle | | | -negotiation] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m2 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=msid:ma tc | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (tc) | | a=sendonly | [RFC3264] - Send only video | | | stream | | a=rtpmap:101 H264/90000 | [RFC3984] | | a=rtpmap:102 H264/90000 | [RFC3984] | Nandakumar & Jennings Expires July 7, 2017 [Page 60] Internet-Draft SDP4WebRTC January 2017 | a=fmtp:101 profile-level-id=42401f | [RFC3984]Camera-2,Encoding- | | ;packetization-mode=0;max-fr=30 | 1 | | a=fmtp:102 profile-level-id=42401f | [RFC3984]Camera-2,Encoding- | | ;packetization-mode=1;max-fr=15 | 2 | | a=fingerprint:sha-256 19:E2:1C:3B:4 | [RFC5245] | | B:9F:81:E6:B8:5C:F4:A5:A8:D8:73:04 | | | :BB:05:2F:70:9F:04:A9:0E:05:E9:26:3 | | | 3:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-mux-only | [I-D.ietf-mmusic-mux-exclus | | | ive] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle | | hdrext:sdes:mid | -negotiation] | | a=ssrc:44444 cname:EocUG1f0fcg/yvY7 | [RFC5576] [RFC7022] | | | Camera-2,Encoding-1 SSRC | | | with Session CNAME | | a=ssrc:55555 cname:EocUG1f0fcg/yvY7 | [RFC5576] [RFC7022] | | | Camera-2,Encoding-2 SSRC | | | with Session CNAME | | a=rid:3 send pt=101;max-width=1280 | [I-D.ietf-mmusic-rid] 1:1 | | ;max-height=720; | rid mapping to payload type | | | and specify resolution | | | constraints | | a=rid:4 send pt=102;max-width=640 | [I-D.ietf-mmusic-rid] 1:1 | | ;max-height=360; | rid mapping to payload type | | | and specify resolution | | | constraints | | a=simulcast: send 3;4 | [I-D.ietf-mmusic-sdp-simulc | | | ast] Alice can send 2 | | | resolutions identified by | | | the 'rid' identifiers | +-------------------------------------+-----------------------------+ Table 25: 5.3.1 SDP Offer +-------------------------------------+-----------------------------+ | Answer SDP Contents | RFC#/Notes | +-------------------------------------+-----------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | Nandakumar & Jennings Expires July 7, 2017 [Page 61] Internet-Draft SDP4WebRTC January 2017 | a=group:BUNDLE m0 m1 m2 | [I-D.ietf-mmusic-sdp-bundle | | | -negotiation] Alice | | | supports grouping of | | | m=lines under BUNDLE | | | semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ic | | | e] | | ****** Audio m=line ********* | *************************** | | | ** | | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m0 | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (ta) | | a=recvonly | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=rtcp-fb:109 nack | [RFC5104] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47ef | [RFC5245] | | babd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65:5 | [RFC5245] | | F:78:E2:51:3B:AC:6F:F3:3F:46:1B:35 | | | :DC:B8:5F:64:1A:24:C2:43:F0:A1:58:D | | | 0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle | | hdrext:sdes:mid | -negotiation] | | a=ssrc:77777 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 61665 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx raddr | | | 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ic | | | e] | | ****** Video-1 m=line ********* | *************************** | | | ** | | m=video 49203 UDP/TLS/RTP/SAVPF 98 | BUNDLE accepted with port | | 100 | repeated from the audio | | | port | | c=IN IP4 98.248.92.77 | [RFC4566] | Nandakumar & Jennings Expires July 7, 2017 [Page 62] Internet-Draft SDP4WebRTC January 2017 | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=msid:ma tb | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (tb) | | a=recvonly | [RFC3264] - receive only | | | video stream | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fmtp:98 max-fr=30 | [RFC4566] | | a=fmtp:100 max-fr=15 | [RFC4566] | | a=fingerprint:sha-256 6B:8B:F0:65:5 | [RFC5245] | | F:78:E2:51:3B:AC:6F:F3:3F:46:1B:35 | | | :DC:B8:5F:64:1A:24:C2:43:F0:A1:58:D | | | 0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5576] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle | | hdrext:sdes:mid | -negotiation] | | a=ssrc:88888 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] - SSRC associated | | | with the receiver report | | | from Bob | | a=rid:1 recv pt=98;max-width=1280 | [I-D.ietf-mmusic-rid] Bob | | ;max-height=720; | accepts the offered payload | | | format constraints | | a=rid:2 recv pt=100;max-width=640 | [I-D.ietf-mmusic-rid] Bob | | ;max-height=480; | accepts the offered payload | | | format constraints | | a=simulcast: recv 1;2 | [I-D.ietf-mmusic-sdp-simulc | | | ast] Bob accepts the | | | offered simulcast streams | | | and removes the paused | | | state of stream with 'rid' | | | value 2. | | ****** Video-2 m=line ********* | *************************** | | | ** | | m=video 49203 UDP/TLS/RTP/SAVPF 101 | BUNDLE accepted with port | | 102 | repeated from the audio | | | port | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m2 | [RFC5888] Video m=line part | | | of BUNDLE group | Nandakumar & Jennings Expires July 7, 2017 [Page 63] Internet-Draft SDP4WebRTC January 2017 | a=msid:ma tc | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (tc) | | a=recvonly | [RFC3264] | | a=rtpmap:101 H264/90000 | [RFC3984] | | a=rtpmap:102 H264/90000 | [RFC3984] | | a=fmtp:101 profile-level-id=42401f | [RFC3984] | | ;packetization-mode=1;max-fr=30 | | | a=fmtp:102 profile-level-id=42401f | [RFC3984] | | ;packetization-mode=1;max-fr=15 | | | a=fingerprint:sha-256 6B:8B:F0:65:5 | [RFC5245] | | F:78:E2:51:3B:AC:6F:F3:3F:46:1B:35 | | | :DC:B8:5F:64:1A:24:C2:43:F0:A1:58:D | | | 0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5576] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle | | hdrext:sdes:mid | -negotiation] | | a=ssrc:99999 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] - SSRC associated | | | with the receiver report | | | from Bob | | a=rid:3 recv pt=101;max-width=1280 | [I-D.ietf-mmusic-rid] Bob | | ;max-height=720; | accepts the offered payload | | | format constraints | | a=rid:4 recv pt=102;max-width=640 | [I-D.ietf-mmusic-rid] Bob | | ;max-height=360; | accepts the offered payload | | | format constraints | | a=simulcast: recv 3;4 | [I-D.ietf-mmusic-sdp-simulc | | | ast] Bob accepts the | | | offered simulcast streams. | +-------------------------------------+-----------------------------+ Table 26: 5.3.1 SDP Answer 5.3.2. Successful SVC Video Session This section shows an SDP Offer/Answer for a session with an audio and a single video source. The video source is encoded as layered coding at 3 different resolutions based on [RFC5583]. The video m=line shows 3 streams with last stream (payload 100) dependent on streams with payload 96 and 97 for decoding. Nandakumar & Jennings Expires July 7, 2017 [Page 64] Internet-Draft SDP4WebRTC January 2017 SVC Session - 3 Layers w/BUNDLE Alice Bob | | | | | Alice offers 3 sendonly video streams | | as 3 layers of SVC and bundle-only | | for video streams. | | | | Offer(Video:H.264 SVC) | |------------------------------------------------>| | | | |Bob accepts Alice's | |offered Codec | |operation points | | | Answer(Video:H.264) | |<------------------------------------------------| | | |One-Way H.264 SVC video streams | |.................................................| | | | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m0 | [RFC5888] Audio m=line part | | | of BUNDLE group with a unique | | | port number | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | Nandakumar & Jennings Expires July 7, 2017 [Page 65] Internet-Draft SDP4WebRTC January 2017 | | ID (ta) | | a=sendonly | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:11111 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 0 UDP/TLS/RTP/SAVPF 96 97 | bundle-only video line with | | 100 | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=bundle-only | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tc) | | a=sendonly | [RFC3264] - Send only video | | | stream | | a=rtpmap:96 H264/90000 | [RFC3984] | | a=fmtp:96 profile-level- | [RFC3984]H.264 Layer 1 | | id=4d0028; packetization-mode=1 | | | ;max-fr=30;max-fs=8040 | | | a=rtpmap:97 H264/90000 | [RFC3984] | | a=fmtp:97 profile-level-id=4d0028 | [RFC3984] H.264 Layer 2 | | ;packetization-mode=1; max-fr=15 | | Nandakumar & Jennings Expires July 7, 2017 [Page 66] Internet-Draft SDP4WebRTC January 2017 | ;max-fs=1200 | | | a=rtpmap:100 H264-SVC/90000 | [RFC3984] | | a=fmtp:100 profile-level- | [RFC3984] | | id=4d0028;packetization-mode=1; | | | max-fr=30;max-fs=8040 | | | a=depend:100 lay m1:96,97; | [RFC5583]Layer 3 dependent on | | | layers 1 and 2 | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:22222 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=ssrc:33333 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=ssrc:44444 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | +-----------------------------------+-------------------------------+ Table 27: 5.3.2 SDP Offer with SVC +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m0 | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | Nandakumar & Jennings Expires July 7, 2017 [Page 67] Internet-Draft SDP4WebRTC January 2017 | | ID (ta) | | a=recvonly | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:88888 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 2113667326 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1694302206 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.5 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 49203 UDP/TLS/RTP/SAVPF | BUNDLE accepted Bundle | | 96 100 | address same as audio m=line. | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=recvonly | [RFC3264] - Receive only | | | video stream | | a=rtpmap:96 H264/90000 | [RFC3984] | | a=fmtp:96 profile-level-id=4d0028 | [RFC3984]H.264 Layer 1 | | ;packetization-mode=1; max-fr=30 | | | ;max-fs=8040 | | | a=rtpmap:100 H264-SVC/90000 | [RFC3984] | | a=fmtp:100 profile-level- | [RFC3984] | | id=4d0028;packetization-mode=1; | | | max-fr=30;max-fs=8040 | | | a=depend:100 lay m1:96; | [RFC5583] Bob chooses 2 Codec | Nandakumar & Jennings Expires July 7, 2017 [Page 68] Internet-Draft SDP4WebRTC January 2017 | | Operation points | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:99999 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | +-----------------------------------+-------------------------------+ Table 28: 5.3.2 SDP Answer with SVC 5.3.3. Successful Simulcast Video Session with Retransmission This section shows an SDP Offer/Answer exchange for a simulcast scenario with 3 resolutions and has [RFC4588] style re-transmission flows. [I-D.ietf-mmusic-rid] framework is used to specify all the (3) resolution constraints mapped to a single Payload Type (98). [I-D.ietf-mmusic-sdp-simulcast] framework identifies the simulcast streams via their 'rid' identifiers. Nandakumar & Jennings Expires July 7, 2017 [Page 69] Internet-Draft SDP4WebRTC January 2017 Simulcast Streams with Retransmission Alice Bob | | | | |Alice offers single audio and simulcasted video streams | | | | | | Offer(Audio:Opus Video:VP8 with 3 resolutions) | | & RTX stream | |-------------------------------------------------------->| | | | | | Answer (Bob accepts Alice's offer) | |<--------------------------------------------------------| | | | | |One-Way 1 Opus, 3 VP8 and RTX video streams,all muxed | |.........................................................| | | | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m0 | [RFC5888] Audio m=line part | | | of BUNDLE group with a unique | | | port number | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendonly | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | Nandakumar & Jennings Expires July 7, 2017 [Page 70] Internet-Draft SDP4WebRTC January 2017 | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:11111 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 0 UDP/TLS/RTP/SAVPF 98 | bundle-only video line with | | 103 | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=bundle-only | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=mid:m1 | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendonly | [RFC3264] | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fmtp:98 max-fr=30 | [RFC4566] | | a=rtpmap:103 rtx/90000 | [RFC4588] | | a=fmtp:103 apt=98;rtx-time=200 | [RFC4588] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:22222 | [RFC5576] - Encoding-1 SSRC | Nandakumar & Jennings Expires July 7, 2017 [Page 71] Internet-Draft SDP4WebRTC January 2017 | cname:EocUG1f0fcg/yvY7 | | | a=ssrc:33333 | [RFC5576] - Encoding-1 RTX | | cname:EocUG1f0fcg/yvY7 | SSRC | | a=ssrc-group:FID 22222 33333 | [RFC5888] | | a=ssrc:44444 | [RFC5576] - Encoding-2 SSRC | | cname:EocUG1f0fcg/yvY7 | | | a=ssrc:55555 | [RFC5576] - Encoding-2 RTX | | cname:EocUG1f0fcg/yvY7 | SSRC | | a=ssrc-group:FID 44444 55555 | [RFC5888] | | a=ssrc:66666 | [RFC5576] - Encoding-3 SSRC | | cname:EocUG1f0fcg/yvY7 | | | a=ssrc:77777 | [RFC5576] - Encoding-3 RTX | | cname:EocUG1f0fcg/yvY7 | SSRC | | a=ssrc-group:FID 66666 77777 | [RFC5888] | | a=rid:1 send pt=98;max-fs=921600 | [I-D.ietf-mmusic-rid] | | ;max-fr=30; | | | a=rid:2 send pt=98;max-fs=614400 | [I-D.ietf-mmusic-rid] | | ;max-fr=15; | | | a=rid:3 send pt=98;max-fs=230400 | [I-D.ietf-mmusic-rid] | | ;max-fr=30; | | | a=simulcast: send 1;2;3 | [I-D.ietf-mmusic-sdp-simulcas | | | t] Alice can send all the | | | simulcast streams | +-----------------------------------+-------------------------------+ Table 29: 5.3.3 SDP Offer w/Simulcast, RTX +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] Bob supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m0 | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | Nandakumar & Jennings Expires July 7, 2017 [Page 72] Internet-Draft SDP4WebRTC January 2017 | | ID (ta) | | a=recvonly | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2113667326 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1694302206 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 49203 UDP/TLS/RTP/SAVPF | BUNDLE accepted with Bundle | | 98 100 101 103 | address identical to audio | | | m-line | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=recvonly | [RFC3264] | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fmtp:98 max-fr=30 | [RFC4566] | | a=rtpmap:103 rtx/90000 | [RFC4588] | | a=fmtp:103 apt=98;rtx-time=200 | [RFC4588] | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | Nandakumar & Jennings Expires July 7, 2017 [Page 73] Internet-Draft SDP4WebRTC January 2017 | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:98765 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=rid:1 recv pt=98;max-fs=921600 | [I-D.ietf-mmusic-rid] | | ;max-fr=30; | | | a=rid:2 recv pt=98;max-fs=614400 | [I-D.ietf-mmusic-rid] | | ;max-fr=15; | | | a=rid:3 recv pt=98;max-fs=230400 | [I-D.ietf-mmusic-rid] | | ;max-fr=30; | | | a=simulcast: recv 1;2;3 | [I-D.ietf-mmusic-sdp-simulcas | | | t] Bob accepts the offered | | | simulcast streams | +-----------------------------------+-------------------------------+ Table 30: 5.3.3 SDP Answer w/Simulcast, RTX 5.3.4. Successful 1-way Simulcast Session with 2 resolutions and RTX - One resolution rejected This section shows an SDP Offer/Answer exchange for a simulcast scenario with 2 two resolutions. It also showcases where Bob rejects one of the Simulcast Video Stream which results in the rejection of the associated repair stream implicitly. Nandakumar & Jennings Expires July 7, 2017 [Page 74] Internet-Draft SDP4WebRTC January 2017 Simulcast Streams with Retransmission Rejected Alice Bob | | | | |Alice offers single audio and simulcasted video streams | | with bundle-only for video | | | | | |Offer(Audio:Opus Video:VP8 with 2 resolutions,RTX Stream)| |-------------------------------------------------------->| | | | |Bob accepts 1 | |simulcast,rtx | |rejects the | |other | Answer(Audio:Opus Video:VP8 with 1 res & RTX Stream) | |<--------------------------------------------------------| | | | | |1-way audio,video session and its associated RTX stream, | | all multiplexed | |.........................................................| | | | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m0 | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | Nandakumar & Jennings Expires July 7, 2017 [Page 75] Internet-Draft SDP4WebRTC January 2017 | | ID (ta) | | a=sendonly | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:11111 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 0 UDP/TLS/RTP/SAVPF 98 | bundle-only video line with | | 100 101 103 | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=bundle-only | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m1 | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb | | a=sendonly | [RFC3264] | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:101 rtx/90000 | [RFC4588] | | a=rtpmap:103 rtx/90000 | [RFC4588] | | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | | a=fmtp:101 apt=98;rtx-time=200 | [RFC4588] | | a=fmtp:103 apt=100;rtx-time=200 | [RFC4588] | | a=setup:actpass | [RFC4145] | Nandakumar & Jennings Expires July 7, 2017 [Page 76] Internet-Draft SDP4WebRTC January 2017 | a=rtcp-mux | [RFC5761] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=rtcp-rsize | [RFC5506] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:22222 | [RFC5576] - Encoding-1 SSRC | | cname:EocUG1f0fcg/yvY7 | | | a=ssrc:33333 | [RFC5576] - Encoding-1 RTX | | cname:EocUG1f0fcg/yvY7 | SSRC | | a=ssrc-group:FID 22222 33333 | [RFC5888] | | a=ssrc:44444 | [RFC5576] - Encoding-2 SSRC | | cname:EocUG1f0fcg/yvY7 | | | a=ssrc:55555 | [RFC5576] - Encoding-2 RTX | | cname:EocUG1f0fcg/yvY7 | SSRC | | a=ssrc-group:FID 44444 55555 | [RFC5888] | | a=rid:1 send pt=98; | [I-D.ietf-mmusic-rid] 1:1 | | | mapping between the PT and | | | the 'rid' identifier | | a=rid:2 send pt=100; | [I-D.ietf-mmusic-rid] 1:1 | | | mapping between the PT and | | | the 'rid' identifier | | a=simulcast: send 1;2 | [I-D.ietf-mmusic-sdp-simulcas | | | t] | +-----------------------------------+-------------------------------+ Table 31: 5.3.4 SDP Offer w/Simulcast, RTX +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] Bob supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m0 | [RFC5888] | Nandakumar & Jennings Expires July 7, 2017 [Page 77] Internet-Draft SDP4WebRTC January 2017 | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=recvonly | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 2113667326 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1694302206 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 49203 UDP/TLS/RTP/SAVPF | BUNDLE accepted with Bundle | | 98 101 | address identical to audio | | | m-line | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m1 | [RFC5888] | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=recvonly | [RFC3264] | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:101 VP8/90000 | [I-D.ietf-payload-vp8] | | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | | a=fmtp:101 apt=98;rtx-time=200 | [RFC4588] | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | Nandakumar & Jennings Expires July 7, 2017 [Page 78] Internet-Draft SDP4WebRTC January 2017 | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:98765 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=rid:1 recv pt=98; | [I-D.ietf-mmusic-rid] | | a=simulcast: recv 1 | [I-D.ietf-mmusic-sdp-simulcas | | | t] Bob rejects the second | | | simulcast stream and the | | | associated rtx stream. | +-----------------------------------+-------------------------------+ Table 32: 5.3.4 SDP Answer (one Simulcast Rejected) 5.3.5. Simulcast Video Session with Forward Error Correction This section shows an SDP Offer/Answer exchange for Simulcast video stream at two resolutions and and has [RFC5956] style FEC flows. On completion of the Offer/Answer exchange mechanism we end up one audio stream, 2 simulcast video streams and 2 associated FEC streams are sent over a single 5-tuple. Nandakumar & Jennings Expires July 7, 2017 [Page 79] Internet-Draft SDP4WebRTC January 2017 Simulcast Streams with Forward Error Correction Alice Bob | | | | | | |Alice offers single audio and simulcasted video streams | |with bundle-only | | | | | |Offer(Audio:Opus Video:VP8 with 2 resolutions with FEC Streams)| |-------------------------------------------------------------->| | | | |Bob | |accepts | |Alice's | |offer |Answer(Audio:Opus Video:VP8 with 2 resolutions w/FEC Streams) | |<--------------------------------------------------------------| | | |One-Way Audio,Video session with 4 video streams(Simulcast | | and FEC) all multiplexed | |...............................................................| | | | | | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] Alice supports | | | grouping of m=lines under | | | BUNDLE semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m0 | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | Nandakumar & Jennings Expires July 7, 2017 [Page 80] Internet-Draft SDP4WebRTC January 2017 | | ID (ta) | | a=sendonly | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:11111 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 0 UDP/TLS/RTP/SAVPF 98 | bundle-only video line with | | 100 101 103 | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=bundle-only | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=sendonly | [RFC3264] | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:101 flexfec/90000 | [I-D.ietf-payload-flexible-fe | | | c-scheme] | | a=rtpmap:103 flexfec/90000 | [I-D.ietf-payload-flexible-fe | | | c-scheme] | | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | Nandakumar & Jennings Expires July 7, 2017 [Page 81] Internet-Draft SDP4WebRTC January 2017 | a=fmtp:101 L=5; D=10; ToP=2; | [I-D.ietf-payload-flexible-fe | | repair-window=200000 | c-scheme] | | a=fmtp:103 L=5; D=10; ToP=2; | [I-D.ietf-payload-flexible-fe | | repair-window=200000 | c-scheme] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:22222 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=ssrc:33333 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=ssrc-group:FEC-FR 22222 33333 | [RFC5956] | | a=ssrc:44444 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=ssrc:55555 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=ssrc-group:FEC-FR 44444 55555 | [RFC5956] | | a=rid:1 send pt=98; | [I-D.ietf-mmusic-rid] 1:1 | | | mapping between the PT and | | | the 'rid' identifier | | a=rid:2 send pt=100; | [I-D.ietf-mmusic-rid] 1:1 | | | mapping between the PT and | | | the 'rid' identifier | | a=simulcast: send 1;2 | [I-D.ietf-mmusic-sdp-simulcas | | | t] | +-----------------------------------+-------------------------------+ Table 33: 5.3.5 SDP Offer +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 | | Nandakumar & Jennings Expires July 7, 2017 [Page 82] Internet-Draft SDP4WebRTC January 2017 | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m0 | [RFC5888] Audio m=line part | | | of BUNDLE group with a unique | | | port number | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=recvonly | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 2113667326 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1694302206 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | | ****** Video m=line ********* | ***************************** | | m=video 49203 UDP/TLS/RTP/SAVPF | BUNDLE accepted with Bundle | | 98 100 101 103 | Address identical to audio | | | m=line. | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:m1 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=msid:ma tb | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (tb) | | a=recvonly | [RFC3264] | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | Nandakumar & Jennings Expires July 7, 2017 [Page 83] Internet-Draft SDP4WebRTC January 2017 | a=rtpmap:101 flexfec/90000 | [I-D.ietf-payload-flexible-fe | | | c-scheme] | | a=rtpmap:103 flexfec/90000 | [I-D.ietf-payload-flexible-fe | | | c-scheme] | | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | | a=fmtp:101 L=5; D=10; ToP=2; | [I-D.ietf-payload-flexible-fe | | repair-window=200000 | c-scheme] | | a=fmtp:103 L=5; D=10; ToP=2; | [I-D.ietf-payload-flexible-fe | | repair-window=200000 | c-scheme] | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:98765 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=rid:1 recv pt=98; | [I-D.ietf-mmusic-rid] | | a=rid:2 recv pt=100; | [I-D.ietf-mmusic-rid] | | a=simulcast: recv 1;2 | [I-D.ietf-mmusic-sdp-simulcas | | | t] | +-----------------------------------+-------------------------------+ Table 34: 5.3.5 SDP Answer 5.4. Others The examples in the section provide SDP Offer/Answer exchange for a variety of scenarios related to RTP Header extension for conference usages, Legacy Interop scenarios and more. 5.4.1. Audio Session - Voice Activity Detection This example shows Alice indicating the support of the RTP header extension to include the audio-level of the audio sample carried in the RTP packet. Nandakumar & Jennings Expires July 7, 2017 [Page 84] Internet-Draft SDP4WebRTC January 2017 2-Way Audio with VAD Alice Bob | | | | |Alice indicates support for including | |audio level in RTP header | | | | Offer(Audio:Opus,PCMU,PCMA) | |---------------------------------------->| | | | | | Answer(Audio:Opus,PCMU,PCMA) | |<----------------------------------------| | | | |Bob accepts and | |indicates his | |support as well | | | Two way Opus Audio | |.........................................| | | |Per packet audio-level is included in the| |RTP header | | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 8 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] | Nandakumar & Jennings Expires July 7, 2017 [Page 85] Internet-Draft SDP4WebRTC January 2017 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=rtpmap:0 PCMU/8000 | [RFC3551] | | a=rtpmap:8 PCMA/8000 | [RFC3551] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 35: 5.4.1 SDP Offer +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 98 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:audio | [RFC5888] | Nandakumar & Jennings Expires July 7, 2017 [Page 86] Internet-Draft SDP4WebRTC January 2017 | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] - Bob can send and | | | recv audio | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | | | Bob accepts only Opus Codec | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:0 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47 | [RFC5245] | | efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] - Bob can perform | | | RTP/RTCP Muxing on port 49203 | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 36: 5.4.1 SDP Answer 5.4.2. Audio Conference - Voice Activity Detection This example shows SDP for RTP header extension that allows RTP-level mixers in audio conferences to deliver information about the audio level of individual participants. Nandakumar & Jennings Expires July 7, 2017 [Page 87] Internet-Draft SDP4WebRTC January 2017 Audio Conference with VAD Support Alice Mixer | | |Alice indicates her interest to audio | |levels for the contributing sources | | | |Offer(Audio:Opus,PCMU,PCMA) | |---------------------------------------->| | | | | |Answer(Audio:Opus,PCMU,PCMA) | |<----------------------------------------| | | | |Mixer indicates | |it can provide | |audio-levels |Two way Opus Audio | |.........................................| | | |Audio-levels per CSRCS is included in the| |RTP header | | | +-----------------------------------+-------------------------------+ | Offer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | | 109 0 8 | | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:54609 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] - Alice can send | | | and recv audio | Nandakumar & Jennings Expires July 7, 2017 [Page 88] Internet-Draft SDP4WebRTC January 2017 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:0 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee34 | [RFC5245] | | 74af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B | [RFC5245] | | :4B:9F:81:E6:B8:5C:F4:A5:A8:D8:73 | | | :04 :BB:05:2F:70:9F:04:A9:0E:05:E | | | 9:26:33:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=extmap:1/recvonly | [RFC6465] | | urn:ietf:params:rtp-hdrext:csrc- | | | audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:3 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:12345 | [RFC5576] | | cname:EocUG1f0fcg/yvY7 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx | | | raddr 192.168.1.4 rport 61665 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 37: 5.4.2 SDP Offer +-----------------------------------+-------------------------------+ | Answer SDP Contents | RFC#/Notes | +-----------------------------------+-------------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | | | Information | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-n | | | egotiation] | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | | ****** Audio m=line ********* | ***************************** | | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | Nandakumar & Jennings Expires July 7, 2017 [Page 89] Internet-Draft SDP4WebRTC January 2017 | 109 0 98 | | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | | a=mid:audio | [RFC5888] | | a=msid:ma ta | Identifies RTCMediaStream ID | | | (ma) and RTCMediaStreamTrack | | | ID (ta) | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | | a=rtpmap:0 PCMA/8000 | [RFC3551] PCMA Audio Codec | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice-pwd:de4e99bd291c325921d5d47 | [RFC5245] | | efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65 | [RFC5245] | | :5F:78:E2:51:3B:AC:6F:F3:3F:46:1B | | | :35 :DC:B8:5F:64:1A:24:C2:43:F0:A | | | 1:58:D0:A1:2C:19:08 | | | a=setup:active | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=extmap:1/sendonly | [RFC6465] | | urn:ietf:params:rtp-hdrext:csrc- | | | audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle-n | | hdrext:sdes:mid | egotiation] | | a=ssrc:54321 | [RFC5576] | | cname:Q/NWs1ao1HmN4Xa5 | | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx | | | raddr 192.168.1.7 rport 51556 | | | a=end-of-candidates | [I-D.ietf-mmusic-trickle-ice] | +-----------------------------------+-------------------------------+ Table 38: 5.4.2 SDP Answer 5.4.3. Successful legacy Interop Fallback with bundle-only In the scenario described below, Alice is a multi-stream capable WebRTC endpoint while Bob is a legacy VOIP end-point. The SDP Offer/ Answer exchange demonstrates successful session setup with fallback to audio only stream negotiated via bundle-only framework between the end-points. Specifically, Nandakumar & Jennings Expires July 7, 2017 [Page 90] Internet-Draft SDP4WebRTC January 2017 o Offer from Alice describes 2 cameras via 2 video m=lines with both marked as bundle-only. o Since Bob doesnot recognize either the BUNDLE mechanism or the bundle-only attribute, he accepts only the audio stream from Alice. NOTE: Since Alice is unaware of Bob's support for BUNDLE framework, Alice ensures to include separate RTP/RTCP ports and candidate information. Successful 2-Way WebRTC <-> VOIP Interop Alice Bob | | | | | Alice is a multistream capable WebRTC end-point | | & Bob is behind a legacy VOIP system | | | |Offer(Audio:Opus Video:2 VP8,2 H2.64 Streams) with | | bundle-only | |---------------------------------------------------------->| | Alice marks both the video streams as bundle-only | | | | | | Answer(Audio:Opus) | |<----------------------------------------------------------| | |Bob | |accepts | |audio | |stream, | |since he | |doesn't | |recognize | |bundle-only | | | Two way Opus Audio | |...........................................................| | | | | +-------------------------------------+-----------------------------+ | Offer SDP Contents | RFC#/Notes | +-------------------------------------+-----------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | Nandakumar & Jennings Expires July 7, 2017 [Page 91] Internet-Draft SDP4WebRTC January 2017 | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=group:BUNDLE m0 m1 m2 | [I-D.ietf-mmusic-sdp-bundle | | | -negotiation] Alice | | | supports grouping of | | | m=lines under BUNDLE | | | semantics | | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ic | | | e] | | ****** Audio m=line ********* | *************************** | | | ** | | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | | a=mid:m0 | [RFC5888] Audio m=line part | | | of BUNDLE group with a | | | unique port number | | a=msid:ma ta | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (ta) | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | | a=rtcp-fb:109 nack | [RFC5104] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice-pwd:a28a397a4c3f31747d1ee3474 | [RFC5245] | | af08a068 | | | a=fingerprint:sha-256 19:E2:1C:3B:4 | [RFC5245] | | B:9F:81:E6:B8:5C:F4:A5:A8:D8:73:04 | | | :BB:05:2F:70:9F:04:A9:0E:05:E9:26:3 | | | 3:E8:70:88:A2 | | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | | hdrext:ssrc-audio-level | | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle | | hdrext:sdes:mid | -negotiation] | | a=ssrc:12345 cname:EocUG1f0fcg/yvY7 | [RFC5576]E | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 61665 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx raddr | | | 192.168.1.4 rport 61665 | | | a=candidate:0 1 UDP 2113667326 | [RFC5245] | | 192.168.1.4 61667 typ host | | | a=candidate:1 1 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx raddr | | Nandakumar & Jennings Expires July 7, 2017 [Page 92] Internet-Draft SDP4WebRTC January 2017 | 192.168.1.4 rport 61667 | | | ****** Video-1 m=line ********* | *************************** | | | ** | | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | bundle-only video line with | | | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=bundle-only | [I-D.ietf-mmusic-sdp-bundle | | | -negotiation] | | a=mid:m1 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=msid:ma tb | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (tb) | | a=sendrecv | [RFC3264] | | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | | a=imageattr:98 [x=1280,y=720] | [RFC6236] | | a=fmtp:98 max-fr=30 | [RFC4566] | | a=setup:actpass | [RFC4145] | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle | | hdrext:sdes:mid | -negotiation] | | a=ssrc:56789 cname:EocUG1f0fcg/yvY7 | [RFC5576] | | ****** Video-2 m=line ********* | *************************** | | | ** | | m=video 0 UDP/TLS/RTP/SAVPF 101 103 | bundle-only video line with | | | port number set to zero | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=bundle-only | [I-D.ietf-mmusic-sdp-bundle | | | -negotiation] | | a=mid:m2 | [RFC5888] Video m=line part | | | of BUNDLE group | | a=msid:ma tc | Identifies RTCMediaStream | | | ID (ma) and | | | RTCMediaStreamTrack ID (tc) | | a=sendrecv | [RFC3264] | | a=rtpmap:101 H264/90000 | [RFC3984] | | a=rtpmap:103 H264/90000 | [RFC3984] | | a=fmtp:101 profile-level-id=4d0028 | [RFC3984]Camera-2,Encoding- | | ;packetization-mode=1;max-fr=30 | 1 Resolution | | a=rtcp-mux | [RFC5761] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:* nack | [RFC5104] | | a=rtcp-fb:* nack pli | [RFC5104] | | a=rtcp-fb:* ccm fir | [RFC5104] | Nandakumar & Jennings Expires July 7, 2017 [Page 93] Internet-Draft SDP4WebRTC January 2017 | a=extmap:2 urn:ietf:params:rtp- | [I-D.ietf-mmusic-sdp-bundle | | hdrext:sdes:mid | -negotiation] | | a=ssrc:67890 cname:EocUG1f0fcg/yvY7 | [RFC5576] | +-------------------------------------+-----------------------------+ Table 39: 5.4.3 SDP Simulcast bundle-only +----------------------------------------+--------------------------+ | Answer SDP Contents | RFC#/Notes | +----------------------------------------+--------------------------+ | v=0 | [RFC4566] | | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | ****** Audio m=line ********* | ************************ | | | ***** | | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtcp:60065 IN IP4 24.23.204.141 | [RFC3605] | | a=sendrecv | [RFC3264] | | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-op | | | us] | | a=maxptime:120 | [RFC4566] | | a=ice-ufrag:ufrag:c300d85b | [RFC5245] | | a=ice- | [RFC5245] | | pwd:de4e99bd291c325921d5d47efbabd9a2 | | | a=fingerprint:sha-256 6B:8B:F0:65:5F:7 | [RFC5245] | | 8:E2:51:3B:AC:6F:F3:3F:46:1B:35 :DC:B8 | | | :5F:64:1A:24:C2:43:F0:A1:58:D0:A1:2C:1 | | | 9:08 | | | a=setup:active | [RFC4145] | | a=rtcp-rsize | [RFC5506] | | a=rtcp-fb:109 nack | [RFC5104] | | a=extmap:1 urn:ietf:params:rtp-hdrext | [RFC6464] | | :ssrc-audio-level | | | a=ssrc:54321 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 51556 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx raddr | | | 192.168.1.7 rport 51556 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 51558 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.77 60065 typ srflx raddr | | | 192.168.1.7 rport 51558 | | | ****** Video m=line ********* | ************************ | Nandakumar & Jennings Expires July 7, 2017 [Page 94] Internet-Draft SDP4WebRTC January 2017 | | ***** | | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | Bob doesn't recognize | | | bundle-only and hence | | | the m=line is rejected | | | implicitly due to port 0 | | ****** Video m=line ********* | ************************ | | | ***** | | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | Bob doesn't recognize | | | bundle-only and hence | | | the m=line is rejected | | | implicitly due to port 0 | +----------------------------------------+--------------------------+ Table 40: 5.4.3 SDP Answer 5.4.4. Legacy Interop with RTP/AVP profile In this section, we attempt to provide session descriptions showcasing inter-operability between a WebRTC end-point and a Legacy VOIP end-point. The ideas included in here are not fully baked into the standards and might be controversial in nature. The hope here is to demonstrate a plausible SDP composition to enchance seamless inter-operability between the aforementioned communication systems. In the scenario desribed below, Alice is a legacy end-point which sends [RFC3264] Offer with two sets of media descriptions per media type. One set that correponds to [WebRTC] compliant UDP/TLS/RTP/SAVPF based audio and video descriptions. Another set with RTP/AVP based audio and video descriptions for the legacy Interop purposes. Also to note, Alice includes session level DTLS information and media level RTCP feedback information as applicable to both the sets of media descriptions On the other hand, Bob being a WebRTC end-point, recognizes accepts the media descriptions with RTP/AVP profile. The security and feedback requirements for the session are either handled by a intermediate gateway or with some combination of Alice's capabilities and the intermediate gateway. Nandakumar & Jennings Expires July 7, 2017 [Page 95] Internet-Draft SDP4WebRTC January 2017 Successful 2-Way WebRTC <-> VOIP Interop Alice Bob | | | | | Alice is a legacy VOIP End-point & Bob is a WebRTC End-Point | | | | | | | | Offer(Audio:Opus Video:H.264) | |-------------------------------------------------------------->| | | | | |Alice includes 2 copies of media descriptions | |1. WebRTC compliant media description (UDP/TLS/RTP/SAVPF) | |2. Legacy compliant media description (RTP/AVP) | | | | | | Answer(Audio:Opus, Video:H.264) | |<--------------------------------------------------------------| | |Bob | |accepts | |"legacy | |compliant" | |m=line | | | | | Two way Opus Audio, H.264 Video | |...............................................................| | Session also suports RTP/RTCP Mux, RTCP Feedback | | | +----------------------------------------+--------------------------+ | Offer SDP Contents | RFC#/Notes | +----------------------------------------+--------------------------+ | v=0 | [RFC4566] | | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=ice-ufrag:074c6550 | [RFC5245] | | a=ice- | [RFC5245] | | pwd:a28a397a4c3f31747d1ee3474af08a068 | | | a=fingerprint:sha-256 6B:8B:F0:65:5F:7 | [RFC5245] | | 8:E2:51:3B:AC:6F:F3:3F:46:1B:35 :DC:B8 | | | :5F:64:1A:24:C2:43:F0:A1:58:D0:A1:2C:1 | | | 9:08 | | | a=rtcp-rsize | [RFC5506] | Nandakumar & Jennings Expires July 7, 2017 [Page 96] Internet-Draft SDP4WebRTC January 2017 | ****** Audio m=line ********* | ************************ | | | ***** | | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtpmap:109 opus/48000 | | | a=ptime:20 | | | a=sendrecv | [RFC3264] | | a=rtcp-mux | [RFC5761] | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54609 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54609 typ srflx raddr | | | 192.168.1.4 rport 54609 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx raddr | | | 192.168.1.4 rport 64678 | | | a=rtcp-fb:109 nack | [RFC5104] | | ****** Audio m=line ********* | ************************ | | | ***** | | m=video 62537 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=sendrecv | [RFC3264] | | a=rtcp-mux | [RFC5761] | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 62537 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 24.23.204.141 62537 typ srflx raddr | | | 192.168.1.4 rport 62537 | | | a=candidate:0 2 2113667326 192.168.1.4 | [RFC5245] | | 54721 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 54721 typ srflx raddr | | | 192.168.1.4 rport 54721 | | | a=rtcp-fb:120 nack pli | [RFC5104] | | a=rtcp-fb:120 ccm fir | [RFC5104] | | --------------- | These set of media | | | descriptions are for | | | Legacy Inter-op purposes | | ****** Audio m=line ********* | ************************ | | | ***** | | m=audio 54732 RTP/AVP 109 | [RFC4566]Alice includes | | | RTP/AVP audio stream | | | description | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=fingerprint:sha-256 19:E2:1C:3B:4B:9 | [RFC5245] | Nandakumar & Jennings Expires July 7, 2017 [Page 97] Internet-Draft SDP4WebRTC January 2017 | F:81:E6:B8:5C:F4:A5:A8:D8:73:04 :BB:05 | | | :2F:70:9F:04:A9:0E:05:E9:26:33:E8:70:8 | | | 8:A2 | | | a=rtpmap:109 opus/48000 | | | a=ptime:20 | | | a=sendrecv | [RFC3264] | | a=rtcp-mux | [RFC5761]Alice still | | | includes RTP/RTCP Mux | | | support | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 54732 typ host | | | a=candidate:1 1 UDP 694302207 | [RFC5245] | | 24.23.204.141 54732 typ srflx raddr | | | 192.168.1.4 rport 54732 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.4 64678 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 64678 typ srflx raddr | | | 192.168.1.4 rport 64678 | | | a=rtcp-fb:109 nack | [RFC5104]She adds her | | | intent for NACK RTCP | | | feedback support | | ****** Video m=line ********* | ************************ | | | ***** | | m=video 62445 RTP/AVP 120 | [RFC4566]Alice includes | | | RTP/AVP video stream | | | description | | c=IN IP4 24.23.204.141 | [RFC4566] | | a=fingerprint:sha-256 DC:B8:5F:64:1A:2 | [RFC5245] | | 4:C2:43:F0:A1:58:D0:A1:2C:19:08 :6B:8B | | | :F0:65:5F:78:E2:51:3B:AC:6F:F3:3F:46:1 | | | B:35 | | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | | a=sendrecv | [RFC3264] | | a=rtcp-mux | [RFC5761]Alice intends | | | to perform RTP/RTCP Mux | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.4 62445 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 24.23.204.141 62537 typ srflx raddr | | | 192.168.1.4 rport 62445 | | | a=candidate:0 2 2113667326 192.168.1.4 | [RFC5245] | | 54721 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 24.23.204.141 54721 typ srflx raddr | | | 192.168.1.4 rport 54721 | | | a=rtcp-fb:120 nack pli | [RFC5104] Alice | | | indicates support for | Nandakumar & Jennings Expires July 7, 2017 [Page 98] Internet-Draft SDP4WebRTC January 2017 | | Picture loss Indication | | | and NACK RTCP feedback | | a=rtcp-fb:120 ccm fir | [RFC5104] | +----------------------------------------+--------------------------+ Table 41: 5.4.5 SDP Offer +----------------------------------------+--------------------------+ | Answer SDP Contents | RFC#/Notes | +----------------------------------------+--------------------------+ | v=0 | [RFC4566] | | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | | s=- | [RFC4566] | | t=0 0 | [RFC4566] | | a=ice-ufrag:c300d85b | [RFC5245] | | a=ice- | [RFC5245] | | pwd:de4e99bd291c325921d5d47efbabd9a2 | | | a=fingerprint:sha-256 BB:05:2F:70:9F:0 | [RFC5245] | | 4:A9:0E:05:E9:26:33:E8:70:88:A2 :19:E2 | | | :1C:3B:4B:9F:81:E6:B8:5C:F4:A5:A8:D8:7 | | | 3:04 | | | ****** Audio m=line ********* | ************************ | | | ***** | | m=audio 49203 RTP/AVP 109 | [RFC4566] Bob accepts | | | RTP/AVP based audio | | | stream | | c=IN IP4 98.248.92.77 | [RFC4566] | | a=rtpmap:109 opus/48000 | | | a=ptime:20 | | | a=sendrecv | [RFC3264] | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 49203 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 49203 typ srflx raddr | | | 192.168.1.7 rport 49203 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 60065 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.77 60065 typ srflx raddr | | | 192.168.1.7 rport 60065 | | | ****** Video m=line ********* | ************************ | | | ***** | | m=video 63130 RTP/SAVP 120 | [RFC4566] Bob accepts | | | RTP/AVP based video | | | stram | | c=IN IP4 98.248.92.771 | [RFC4566] | | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | Nandakumar & Jennings Expires July 7, 2017 [Page 99] Internet-Draft SDP4WebRTC January 2017 | a=sendrecv | [RFC3264] | | a=candidate:0 1 UDP 2113667327 | [RFC5245] | | 192.168.1.7 63130 typ host | | | a=candidate:1 1 UDP 1694302207 | [RFC5245] | | 98.248.92.77 63130 typ srflx raddr | | | 192.168.1.7 rport 63130 | | | a=candidate:0 2 UDP 2113667326 | [RFC5245] | | 192.168.1.7 56607 typ host | | | a=candidate:1 2 UDP 1694302206 | [RFC5245] | | 98.248.92.77 56607 typ srflx raddr | | | 192.168.1.7 rport 56607 | | +----------------------------------------+--------------------------+ Table 42: 5.4.5 SDP Answer 6. IANA Considerations This document requires no actions from IANA. 7. Acknowledgments We would like to thank Justin Uberti, Chris Flo, Paul Kyzivat for their detailed review and inputs. 8. Change Log [RFC EDITOR NOTE: Please remove this section when publishing] Changes from draft-ietf-rtcweb-sdp-02 o Version increment to avoid expiry Changes from draft-ietf-rtcweb-sdp-01 o Complete face-lift o Added visual markers around m=lines to indicate their type, added spacing between tables for aiding readers o Updated table names to indicate offer vs answer o Attempted to align to latest versions of SCTP, BUNDLE, MSID drafts o Added mid header extensions to all the lines o Harmonized BUNDLE semantics and conventions updated. Nandakumar & Jennings Expires July 7, 2017 [Page 100] Internet-Draft SDP4WebRTC January 2017 Changes from draft-ietf-rtcweb-sdp-00 o Updated Simulcast/FEC/RTX examples to use RID framework o Fixed BUNDLE references for a=bundle-only Changes from draft-nandakumar-rtcweb-sdp-08 o Fixed typos o Moved to a WG version Changes from draft-nandakumar-rtcweb-sdp-06 and draft-nandakumar- rtcweb-sdp-07 o Added clarification on Call-Flow diagram usage o More cleanups Changes from draft-nandakumar-rtcweb-sdp-05 o Added Ascii chart for all the SDP Eaxamples o Improved text and updated SDP Examples for Simulcast and FEC o Fixed MediaStream ID Semantics SDP Errors Changes from draft-nandakumar-rtcweb-sdp-04 o Interim version of the draft to avert expiry o Corrected placement of c= line as per RFC4566 o Updated simulcast SDP to reflect draft-westerlund-avtcore-rtp- simulcast-04 Changes from draft-nandakumar-rtcweb-sdp-03 o Aligned more closely with JSEP version -05 o Added Conventions to help readability o Add more examples to clarify BUNDLE use-cases Changes from draft-nandakumar-rtcweb-sdp-02 o Major refactoring was done to group the examples in to categories Nandakumar & Jennings Expires July 7, 2017 [Page 101] Internet-Draft SDP4WebRTC January 2017 o SDP was updated through out to reflect JSEP-04 style of defining attributes per m=line than at the session level. o Added 8 new examples. o Updated references for Trickle, Unified Plan o Add section to explain the syntax conventions followed in the examples. Changes from draft-nandakumar-rtcweb-sdp-01 o Updated references to OPUS RTP Payload Specification. o Updated BUNDLE examples based on the latest draft-ietf-mmusic-sdp- bundle-negotiation. o Added examples for multiple audio and video flows based on Unified Plan. o Added new examples for RTX and FEC streams o Updated Simulcast and SVC examples Changes from draft-nandakumar-rtcweb-sdp-00 o Fixed editorial comments on the mailing list. o Updated Data-channel SDP information based on draft-ietf-mmusic- sctp-sdp. o Updated BUNDLE examples based on draft-ietf-mmusic-sdp-bundle- negotiation. o Added examples for few more BUNDLE variants o Added new examples for Simulcast and SVC 9. Informative References [RFC3264] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model with Session Description Protocol (SDP)", RFC 3264, DOI 10.17487/RFC3264, June 2002, . Nandakumar & Jennings Expires July 7, 2017 [Page 102] Internet-Draft SDP4WebRTC January 2017 [RFC4145] Yon, D. and G. Camarillo, "TCP-Based Media Transport in the Session Description Protocol (SDP)", RFC 4145, DOI 10.17487/RFC4145, September 2005, . [RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session Description Protocol", RFC 4566, DOI 10.17487/RFC4566, July 2006, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/ RFC2119, March 1997, . [RFC5245] Rosenberg, J., "Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols", RFC 5245, DOI 10.17487/RFC5245, April 2010, . [RFC5506] Johansson, I. and M. Westerlund, "Support for Reduced-Size Real-Time Transport Control Protocol (RTCP): Opportunities and Consequences", RFC 5506, DOI 10.17487/RFC5506, April 2009, . [RFC3551] Schulzrinne, H. and S. Casner, "RTP Profile for Audio and Video Conferences with Minimal Control", STD 65, RFC 3551, DOI 10.17487/RFC3551, July 2003, . [RFC3952] Duric, A. and S. Andersen, "Real-time Transport Protocol (RTP) Payload Format for internet Low Bit Rate Codec (iLBC) Speech", RFC 3952, DOI 10.17487/RFC3952, December 2004, . [RFC4796] Hautakorpi, J. and G. Camarillo, "The Session Description Protocol (SDP) Content Attribute", RFC 4796, DOI 10.17487/ RFC4796, February 2007, . [RFC5761] Perkins, C. and M. Westerlund, "Multiplexing RTP Data and Control Packets on a Single Port", RFC 5761, DOI 10.17487/ RFC5761, April 2010, . Nandakumar & Jennings Expires July 7, 2017 [Page 103] Internet-Draft SDP4WebRTC January 2017 [RFC3556] Casner, S., "Session Description Protocol (SDP) Bandwidth Modifiers for RTP Control Protocol (RTCP) Bandwidth", RFC 3556, DOI 10.17487/RFC3556, July 2003, . [RFC5104] Wenger, S., Chandra, U., Westerlund, M., and B. Burman, "Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF)", RFC 5104, DOI 10.17487/RFC5104, February 2008, . [RFC4588] Rey, J., Leon, D., Miyazaki, A., Varsa, V., and R. Hakenberg, "RTP Retransmission Payload Format", RFC 4588, DOI 10.17487/RFC4588, July 2006, . [RFC5956] Begen, A., "Forward Error Correction Grouping Semantics in the Session Description Protocol", RFC 5956, DOI 10.17487/ RFC5956, September 2010, . [RFC5888] Camarillo, G. and H. Schulzrinne, "The Session Description Protocol (SDP) Grouping Framework", RFC 5888, DOI 10.17487/RFC5888, June 2010, . [RFC6236] Johansson, I. and K. Jung, "Negotiation of Generic Image Attributes in the Session Description Protocol (SDP)", RFC 6236, DOI 10.17487/RFC6236, May 2011, . [RFC3984] Wenger, S., Hannuksela, M., Stockhammer, T., Westerlund, M., and D. Singer, "RTP Payload Format for H.264 Video", RFC 3984, DOI 10.17487/RFC3984, February 2005, . [RFC5583] Schierl, T. and S. Wenger, "Signaling Media Decoding Dependency in the Session Description Protocol (SDP)", RFC 5583, DOI 10.17487/RFC5583, July 2009, . [RFC5576] Lennox, J., Ott, J., and T. Schierl, "Source-Specific Media Attributes in the Session Description Protocol (SDP)", RFC 5576, DOI 10.17487/RFC5576, June 2009, . Nandakumar & Jennings Expires July 7, 2017 [Page 104] Internet-Draft SDP4WebRTC January 2017 [RFC3550] Schulzrinne, H., Casner, S., Frederick, R., and V. Jacobson, "RTP: A Transport Protocol for Real-Time Applications", STD 64, RFC 3550, DOI 10.17487/RFC3550, July 2003, . [RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A., Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP: Session Initiation Protocol", RFC 3261, DOI 10.17487/RFC3261, June 2002, . [RFC2326] Schulzrinne, H., Rao, A., and R. Lanphier, "Real Time Streaming Protocol (RTSP)", RFC 2326, DOI 10.17487/ RFC2326, April 1998, . [RFC3605] Huitema, C., "Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP)", RFC 3605, DOI 10.17487/RFC3605, October 2003, . [RFC2833] Schulzrinne, H. and S. Petrack, "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals", RFC 2833, DOI 10.17487/RFC2833, May 2000, . [RFC6464] Lennox, J., Ed., Ivov, E., and E. Marocco, "A Real-time Transport Protocol (RTP) Header Extension for Client-to- Mixer Audio Level Indication", RFC 6464, DOI 10.17487/ RFC6464, December 2011, . [RFC6465] Ivov, E., Ed., Marocco, E., Ed., and J. Lennox, "A Real- time Transport Protocol (RTP) Header Extension for Mixer- to-Client Audio Level Indication", RFC 6465, DOI 10.17487/ RFC6465, December 2011, . [RFC7022] Begen, A., Perkins, C., Wing, D., and E. Rescorla, "Guidelines for Choosing RTP Control Protocol (RTCP) Canonical Names (CNAMEs)", RFC 7022, DOI 10.17487/RFC7022, September 2013, . [I-D.ietf-mmusic-sdp-bundle-negotiation] Holmberg, C., Alvestrand, H., and C. Jennings, "Negotiating Media Multiplexing Using the Session Description Protocol (SDP)", draft-ietf-mmusic-sdp-bundle- negotiation-24 (work in progress), January 2016. Nandakumar & Jennings Expires July 7, 2017 [Page 105] Internet-Draft SDP4WebRTC January 2017 [I-D.ietf-mmusic-sdp-simulcast] Burman, B., Westerlund, M., Nandakumar, S., and M. Zanaty, "Using Simulcast in SDP and RTP Sessions", draft-ietf- mmusic-sdp-simulcast-03 (work in progress), October 2015. [I-D.ietf-mmusic-rid] Thatcher, P., Zanaty, M., Nandakumar, S., Burman, B., Roach, A., and B. Campen, "RTP Payload Format Constraints", draft-ietf-mmusic-rid-04 (work in progress), February 2016. [I-D.ietf-payload-rtp-opus] Spittka, J., Vos, K., and J. Valin, "RTP Payload Format for the Opus Speech and Audio Codec", draft-ietf-payload- rtp-opus-11 (work in progress), April 2015. [I-D.ietf-payload-vp8] Westin, P., Lundin, H., Glover, M., Uberti, J., and F. Galligan, "RTP Payload Format for VP8 Video", draft-ietf- payload-vp8-17 (work in progress), September 2015. [I-D.ietf-rtcweb-jsep] Uberti, J., Jennings, C., and E. Rescorla, "Javascript Session Establishment Protocol", draft-ietf-rtcweb-jsep-12 (work in progress), October 2015. [I-D.ietf-mmusic-trickle-ice] Ivov, E., Rescorla, E., and J. Uberti, "Trickle ICE: Incremental Provisioning of Candidates for the Interactive Connectivity Establishment (ICE) Protocol", draft-ietf- mmusic-trickle-ice-02 (work in progress), January 2015. [I-D.ietf-mmusic-msid] Alvestrand, H., "WebRTC MediaStream Identification in the Session Description Protocol", draft-ietf-mmusic-msid-11 (work in progress), October 2015. [I-D.ietf-mmusic-sctp-sdp] Holmberg, C., Loreto, S., and G. Camarillo, "Stream Control Transmission Protocol (SCTP)-Based Media Transport in the Session Description Protocol (SDP)", draft-ietf- mmusic-sctp-sdp-15 (work in progress), September 2015. [I-D.ietf-rtcweb-data-channel] Jesup, R., Loreto, S., and M. Tuexen, "WebRTC Data Channels", draft-ietf-rtcweb-data-channel-13 (work in progress), January 2015. Nandakumar & Jennings Expires July 7, 2017 [Page 106] Internet-Draft SDP4WebRTC January 2017 [I-D.ietf-payload-flexible-fec-scheme] Singh, V., Begen, A., Zanaty, M., and G. Mandyam, "RTP Payload Format for Flexible Forward Error Correction (FEC)", draft-ietf-payload-flexible-fec-scheme-01 (work in progress), October 2015. [I-D.ietf-mmusic-mux-exclusive] Holmberg, C., "Indicating Exclusive Support of RTP/RTCP Multiplexing using SDP", draft-ietf-mmusic-mux- exclusive-08 (work in progress), June 2016. [WebRTC] W3C, "WebRTC 1.0: Real-time Communication Between Browsers", , . Authors' Addresses Suhas Nandakumar Cisco 170 West Tasman Drive San Jose, CA 95134 USA Email: snandaku@cisco.com Cullen Jennings Cisco 170 West Tasman Drive San Jose, CA 95134 USA Phone: +1 408 421-9990 Email: fluffy@cisco.com Nandakumar & Jennings Expires July 7, 2017 [Page 107]