The IESG has approved the following document:
- 'Representing trunk groups in tel/sip Uniform Resource
Identifiers
(URIs) '
<draft-ietf-iptel-trunk-group-10.txt> as a Proposed
Standard
This document is the product of the IP Telephony Working
Group.
The IESG contact persons are Jon Peterson and Cullen
Jennings.
A URL of this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft
-ietf-iptel-trunk-group-10.txt
Technical Summary
The trunk group extension to the tel URI defines two new URI
parameters
for use with the tel URI (defined in RFC 3966). These two
new URI
parameters, "tgrp" and "trunk-context"
indicate the name and namespace
scope for a trunk group. A trunk group is a collection of
circuits in the
Public Switched Telephone Network (PSTN) which are managed
as a group. One
trunk group, for example, can be used for toll free calls,
while another
one used for calls to a certain carrier, and another for
calls to a
certain local calling area. Consequently, when connecting
calls from the
PSTN into a VoIP network, and connecting calls from a VoIP
network into
the PSTN, it is necessary to convey trunk group information
in the VoIP
domain. For example, a SIP proxy may route a call towards a
PSTN gateway,
and need to indicate that a specific trunk group should be
used. As
another example, a call from a PSTN gateway towards a SIP
proxy might need
to indicate that the call arrived from a specific trunk
group, so that the
SIP proxy might make appropriate call routing decisions.
The specification defines the syntax for these parameters,
matching
rules, and usage of them with SIP.
Working Group Summary
The draft is a charter item of the IP Telephony (iptel)
working group, and
is targeted for Proposed Standard. It was adopted as a
working group item
in early 2003 and discussed on the mailing list and in many
meetings since
its adoption.
Protocol Quality
The specification has been implemented in many products and
there areknown
deployments of it. The specification itself has received
reviews from
telephony experts as well as SIP experts. This document was
reviewed for
the IESG by Jon Peterson.
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