Representing Trunk Groups in tel/sip Uniform Resource Identifiers (URIs)
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From: The IESG <firstname.lastname@example.org> To: IETF-Announce <email@example.com> Cc: Internet Architecture Board <firstname.lastname@example.org>, RFC Editor <email@example.com>, iptel mailing list <firstname.lastname@example.org>, iptel chair <email@example.com> Subject: Protocol Action: 'Representing trunk groups in tel/sip Uniform Resource Identifiers (URIs)' to Proposed Standard The IESG has approved the following document: - 'Representing trunk groups in tel/sip Uniform Resource Identifiers (URIs) ' <draft-ietf-iptel-trunk-group-11.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-11.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.