Internet DRAFT - draft-itu-sg2-liaison-enum

draft-itu-sg2-liaison-enum



Network Working Group                                            R Blane
Internet-Draft                                                       ITU
Expires: May 1, 2001                                    October 31, 2000


                       Liaison to IETF/ISOC on ENUM
                     draft-itu-sg2-liaison-enum-00.txt

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Copyright Notice

    Copyright (C) The Internet Society (2000). All Rights Reserved.

Abstract

    Working Party 1/2, of the International Telecommunication Union P
    Telecommunication Standardization Sector (ITU-T) held a meeting of
    its collaborators in Berlin Germany 19-26 October 2000. The agenda
    of the meeting contained several contributions regarding RFC 2916:
    "E.164 Number and DNS" from the Internet Engineering Task Force's
    (IETF) ENUM Working Group - more specifically, the method for
    administering and maintaining the E.164-based resources in the
    Domain Name System (DNS) as related to the ENUM protocol.
    Consequently, in addition to the WP1/2 collaborators, there were
    several members of the IETF present to assist with the discussion of
    issues contained in the aforementioned contributions.

    This liaison from WP1/2 to the IETF/ISOC conveys the understandings


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    of the WP1/2 collaborators resulting from the discussions.


















































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1. Considerations under Question 1/2 (Numbering)

    Throughout this document, the terms RadministrationS or
    Radministrative functions refer to the provision and update of the
    E.164 numerical values, to be contained in the zones of a domain
    name in the "e164.arpa" domain, in the DNS.

    It is noted that most ENUM service and administrative decisions are
    national issues under the purview of ITU Member States, since most
    of the E.164 resources are utilized nationally.

    These understandings are relative only to the provision of E.164
    information for DNS administrative functions, not policy or
    operational functions.

    In order to advance a common terminology for the purpose of this
    liaison, we have defined the zones of a domain name as follows.

    Using an example, domain name "1.5.1.5.0.2.0.4.1.3.3.e164.arpa" (as
    in RFC 2916) is segmented into zones as follow:

       E164.arpa - domain zone

       3.3. - country code zone (1, 2, or 3 digits dependent on CC)

       7 1.5.1.5.0.2.0.4.1. - national zone

    The first understandings to be conveyed are those regarding the
    responsibilities for administration of the various zones within the
    "e164.arpa" domain:

    o  The domain zone administration was agreed to be outside the scope
       of this meeting and WP1/2.

    o  For all E.164 Country Code Zone resources (Country Codes and
       Identification Codes), the ITU has the responsibility to provide
       assignment information to DNS administrators, for performing the
       administrative function. The ITU will ensure that each Member
       State has authorized the inclusion of their Country Code
       information for input to the DNS. For resources that are spare or
       designated as test codes there will normally be no entry in the
       DNS. However, the ITU will provide spare code lists to DNS
       administrators for purposes of clarification. The entity to which
       E.164 test codes have been assigned will be responsible for
       providing any appropriate assignment information to DNS
       administrators.

    o  The administration of National Zone numbering information is
       determined by the type of Country Code resource that a National


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       Zone is behind:

       *  The national zone, for geographic resources, is a national
          matter and is, therefore, administered by the ITU Member
          State(s) to which the country code is assigned. In an
          integrated numbering plan, e.g., CC R1S, each Country within
          the plan may administer their portion of the resource in a
          different manner.

       *  For national zone resources behind the Country Codes assigned
          to and shared by Networks, the entity to which the resource is
          assigned provides the E.164 assignment information, to DNS
          administrators for performing the administrative function.

       *  For national zone resources behind the Country Codes assigned
          to and shared by Networks, the entity to which the resource is
          assigned provides the E.164 assignment information, to DNS
          administrators for performing the administrative function.

    o  Each of the administrative entities responsible for the
       administration of resources within the zones (as identified
       above) is individually and separately responsible for ensuring
       that DNS administrators are aware of appropriate changes to their
       resources once they have agreed to their input into the DNS.

    o  Assigned geographic E.164 resources, for all zones, not
       authorized for input by the appropriate administrative entity
       will not be entered into the DNS under any circumstance. For
       example, if the ENUM service is not approved for use in a
       country, by the appropriate ITU Member States, the E.164 numbers
       of that country will not be input to the DNS.

    o  With regard to Number Portability, it was agreed that WP1/2 would
       further study this issue, in the context of ENUM. However, it is
       currently understood that this study and its result will not
       impact the IETF and its work.

    o  The study being undertaken within WP1/2 (referred to above) will
       also attempt to identify options and provide guidance to assist
       those entities charged with the task of providing the
       administrative information to DNS administrators.

    o  All administrative entities, including DNS administrators, will
       adhere to all the applicable tenets of all pertinent ITU
       Recommendations, e.g., E.164, E.164.1, E.190, and E.195, with
       regard to the inclusion of the E.164 resource information in the
       DNS.

    o  The ITU, IETF, and IAB will jointly cooperate fully to ensure


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       that the agreed administrative procedures to accommodate the
       above understandings, and any other mutually agreed appropriate
       future understandings, will be implemented and adhered to on an
       ongoing basis. The ITU may request the consultation of the WP1/2
       experts as necessary and as prescribed in Resolution 20.














































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2. Additional items below are from Q.10/2 Rapporteur Group (Service
    Issues)

    o  The issues surrounding number portability are to be addressed in
       the draft supplement to Recommendation E.370

    o  This issue surrounding freephone service was expanded to include
       other global services (i.e., International Premium Rate Service
       and International Shared Cost Service). Preliminary findings
       would indicate that routing the call to the appropriate
       destination will depend on successfully receiving information
       about the geographic point of origination (e.g., calling
       "telephone Number"). A proxy server would process such
       information and either redirect or forward the call (based on the
       proxy owner's decision) on to the appropriate destination.

    o  The issue surrounding selection of the IP gateway within a
       PSTN-to-IP call flow may depend on options that may be available
       to telephony carriers in such selection.

    The WP1/2 collaborators thank their IETF counterparts who attended
    this meeting and assisted in the resolution of these issues.

    Any questions regarding the contents of this liaison should be
    referred to the WP1/2 Chairman Roy Blane at Roy_Blane@inmarsat.com.


Author's Address

    Roy Blane
    ITU

    EMail: Roy_Blane@inmarsat.com
    URI:   http://www.itu.int

















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Acknowledgement

    Funding for the RFC editor function is currently provided by the
    Internet Society.



















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