Indicating User Agent Capabilities in the Session Initiation Protocol (SIP)
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From: The IESG <email@example.com> To: IETF-Announce <firstname.lastname@example.org> Cc: Internet Architecture Board <email@example.com>, RFC Editor <firstname.lastname@example.org>, sip mailing list <email@example.com>, sip chair <firstname.lastname@example.org> Subject: Protocol Action: 'Indicating User Agent Capabilities in the Session Initiation Protocol (SIP)' to Proposed Standard The IESG has approved the following document: - 'Indicating User Agent Capabilities in the Session Initiation Protocol (SIP) ' <draft-ietf-sip-callee-caps-04.txt> as a Proposed Standard This document is the product of the Session Initiation Protocol Working Group. The IESG contact persons are Allison Mankin and Jon Peterson. A URL of this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-sip-callee-caps-04.txt
Technical Summary This specification defines mechanisms by which a Session Initiation Protocol (SIP) user agent can convey its capabilities and characteristics to other user agents and to the registrar for its domain. This information is conveyed as parameters of the Contact header field. It may be used by a proxy for call routing. The parameter design is based on RFC 2506, media feature tags. The specification creates a SIP tree registry parallel to the IETF tree registry from RFC 2506. The syntax of the parameters is based on RFC 2533. Strong considerations regarding the privacy and data integrity of the information are discussed by the document. Working Group Summary The working group took a lot of care and review developing this design. There was a mid-course design review from an Applications area standpoint that resulted in the advice to work with the RFC 2533, 2506 approach, which has proved to be very constructive. The WG supported the advancement strongly, after thorough review. Protocol Quality The document was reviewed for the IESG by Allison Mankin. The Applications mid-course reviews were by Patrik Faltstrom and Ted Hardie.