Usage of the Session Description Protocol (SDP) Alternative Network Address Types (ANAT) Semantics in the Session Initiation Protocol (SIP)
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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>, sip mailing list <firstname.lastname@example.org>, sip chair <email@example.com> Subject: Protocol Action: 'Usage of the Session Description Protocol (SDP) Alternative Network Address Types (ANAT) Semantics in the Session Initiation Protocol (SIP)' to Proposed Standard The IESG has approved the following document: - 'Usage of the Session Description Protocol (SDP) Alternative Network Address Types (ANAT) Semantics in the Session Initiation Protocol (SIP) ' <draft-ietf-sip-anat-usage-01.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-anat-usage-01.txt
Technical Summary This document describes how to use the Alternative Network Address Types (ANAT) semantics of the SDP grouping framework in SIP. In particular, we define the sdp-anat SIP option-tag. This SIP option-tag ensures that SDP session descriptions using ANAT are only handled by SIP entities with ANAT support. The document describes the issues if SIP entities interpret ANAT media grouping without the expectation that an option-tag will identify them. ANAT media groupings allow a SIP entity to signal its peer that it has both IPv4 and IPv6 address support (within SDP's ability to express both families). There is no presumption of how these addresses should be chosen by the two peers, but the ANAT grouping in SDP supports the application's use of ICE (Interactive Connectivity Establishment) RFC 3424-aware NAT traversal methodology. Working Group Summary This draft was developed because draft-ietf-mmusic-anat required a SIP option-tag for use with SIP. The SIP Working Group supported working group adoption and advancement of the draft. Protocol Quality The specification was reviewed for the IESG by Allison Mankin. Some discussion was needed to require strong error handling. RFC Editor Note: Expand the first appearance of ANAT in the Abstract and the Introduction - Alternative Network Address Types Security Considerations OLD: The natural choice to integrity protect header fields in SIP is S/MIME. NEW: The natural choice to integrity protect header fields in SIP is S/MIME. [RFC3853] And please add a normative reference to RFC 3853.