Multiplexing RTP Data and Control Packets on a Single Port
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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>, avt mailing list <firstname.lastname@example.org>, avt chair <email@example.com> Subject: Protocol Action: 'Multiplexing RTP Data and Control Packets on a Single Port' to Proposed Standard The IESG has approved the following document: - 'Multiplexing RTP Data and Control Packets on a Single Port ' <draft-ietf-avt-rtp-and-rtcp-mux-07.txt> as a Proposed Standard This document is the product of the Audio/Video Transport Working Group. The IESG contact persons are Cullen Jennings and Jon Peterson. A URL of this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-avt-rtp-and-rtcp-mux-07.txt
Technical Summary This memo discusses issues that arise when multiplexing RTP data packets and RTP control protocol (RTCP) packets on a single UDP port. It updates RFC 3550 to describe when such multiplexing is, and is not, appropriate, and explains how the Session Description Protocol (SDP) can be used to signal multiplexed sessions. Working Group Summary This document represents a solid consensus of the AVT Working Group, with informal concurrence of the MMUSIC and BEHAVE Working Groups. Following the initial proposal, the major issue subsequently considered and resolved was how to negotiate the multiplexing capability and achieve fail-safe behavior. The decision was to provide a new SDP attribute to signal the multiplexing capability explicitly. There was also some discussion of how to signal bandwidth requirements. The outcome was a decision to include allowance for RTCP traffic in the b=AS: value. Document Quality The document has attracted considerable interest because it makes NAT traversal easier. Jonathan Rosenberg, author of the ICE document, reviewed the proposal in terms of its interaction with ICE and provided related text. Randell Jesup deserves special mention for his careful reviews of successive versions of the document and persistence in analysis of the associated signaling issues. Personnel Document Shepherd was Tom Taylor. Responsible Area Director was Cullen Jennings. Note to RFC Editor Please change this document so that it also updates RFC 3551.