Internet DRAFT - draft-haluska-gr506-4733-codepoints
draft-haluska-gr506-4733-codepoints
Individual Submission J. Haluska
Internet Draft Telcordia
Intended status: Informational November 30, 2011
Expires: May 2012
Audio/telephone-event Codes for Operator Services and SIT Tones
draft-haluska-gr506-4733-codepoints-00.txt
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), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
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."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html
This Internet-Draft will expire on May 30, 2009.
Copyright Notice
Copyright (c) 2011 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.
Haluska Expires May 30, 2012 [Page 1]
Internet-Draft RTP Event Codes for Operator Services and SIT Tones
November 2011
Abstract
This document provides additional information on the use of several
specific event codes related to North American Operator Services and
Special Information Tones that have been registered in the IANA
"audio/telephone-event" registry.
Table of Contents
1. Introduction...................................................2
2. Discussion.....................................................2
3. Security Considerations........................................4
4. IANA Considerations............................................4
5. References.....................................................4
5.1. Normative References......................................4
5.2. Informative References....................................4
6. Acknowledgments................................................5
1. Introduction
This document provides additional information on the use of several
specific event codes related to North American Operator Services and
Special Information Tones that have been registered in the IANA
"audio/telephone-event" registry.
2. Discussion
[RFC4733]defines a mechanism for conveyance of tone signals and other
telephony events in RTP packets, and establishes an IANA registry as
well as procedures for registration of "audio/telephone-event" codes.
Further, [RFC5244] defines and registers additional audio/telephone-
event codes for channel-oriented telephony signaling.
In North American PSTN networks, "Special Information Tones" are
played back towards the caller to convey reasons for call failure,
such as circuit congestion, etc. These tones are defined in [GR674],
and audio/telephone-event codes have been registered for these
signals as well. These include:
o North American SIT Segment 1 Low
o North American SIT Segment 1 High
o North American SIT Segment 2 Low
Haluska Expires May 30, 2012 [Page 2]
Internet-Draft RTP Event Codes for Operator Services and SIT Tones
November 2011
o North American SIT Segment 2 High
o North American SIT Segment 3
In North American PSTN networks, there are additional channel-
oriented telephony signals that are not defined in [RFC5244]. A
subset of these are defined in [GR506], and audio/telephone-event
codes have been registered with IANA for these signals. These signals
include:
o North American Coin Deposit
o North American Ringback
o North American Coin Return
o North American Coin Collect / Operator Released
o North American Operator Attached
o North American Coin Collect
o North American Operator Released
These event codes are expected to be used in contexts similar to
those in which the event codes defined in [RFC5244] would be used,
i.e., channel associated inband telephony signaling.
The documents listed as references for these event codes in the IANA
registry, i.e. [GR506] and [GR674], define the telephony signals in
terms of frequency components and duration, and in some cases, also
in terms of a specific number of tone bursts with specific timing
requirements.
As with the signals described in [RFC5244], the event codes for these
signals only represent the frequency component(s) of the signals; the
duration and timing are not conveyed by the event code. That is,
there is nothing implicit in these event codes conveying timing
information about pulse duration, timing, silent interval duration,
or number of pulses. Pulses must be constructed using these event
codes the same as would be done with those defined in [RFC5244].
Haluska Expires May 30, 2012 [Page 3]
Internet-Draft RTP Event Codes for Operator Services and SIT Tones
November 2011
3. Security Considerations
This document does not introduce any new protocol mechanisms, and
does not introduce any security concerns.
4. IANA Considerations
This document does not request any actions of IANA. It provides
additional information regarding the use of codepoints already
registered by IANA.
5. References
5.1. Normative References
[RFC4733] Schulzrinne, H. and T. Taylor, "RTP Payload for DTMF
Digits, Telephony Tones and Telephony Signals", RFC 4733,
December 2006.
[RFC5244] Schulzrinne, H. and T. Taylor, "Definition of Events for
Channel-Oriented Telephony Signalling", RFC 5244, June
2008.
[GR506] GR-506-CORE, "LSSGR: Signaling for Analog Interfaces".
Telcordia Technologies, Issue 2, December 2006.
[GR674] GR-674-CORE, "LSSGR: Special Information Tones". Telcordia
Technologies, Issue 1, June 2000.
5.2. Informative References
None
Haluska Expires May 30, 2012 [Page 4]
Internet-Draft RTP Event Codes for Operator Services and SIT Tones
November 2011
6. Acknowledgments
This document was prepared using 2-Word-v2.0.template.dot.
Authors' Addresses
John Haluska
Telcordia
331 Newman Springs Road, Room 2Z-469
Red Bank, NJ 07701-5699
Email: jhaluska@research.telcordia.com
Haluska Expires May 30, 2012 [Page 5]
