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 (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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