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Session Description Protocol (SDP) Offer/Answer Clarifications for RTP/RTCP Multiplexing (RFC8035) Disclosure Number: IPCOM000248434D
Original Publication Date: 2016-Nov-01
Included in the Prior Art Database: 2016-Nov-29
Document File: 14 page(s) / 12K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

C. Holmberg: AUTHOR


RFC 5761 [RFC5761] specifies how to multiplex RTP data packets and RTP Control Protocol (RTCP) packets on a single UDP port, and how to negotiate usage of such multiplexing using the SDP offer/answer mechanism [RFC3264] with an "a=rtcp-mux" attribute. However, the text is unclear on whether an answerer is allowed to include the attribute in an answer even if the associated offer did not contain an attribute.

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Internet Engineering Task Force (IETF)                       C. Holmberg Request for Comments: 8035                                      Ericsson Updates: 5761                                              November 2016 Category: Standards Track ISSN: 2070-1721

      Session Description Protocol (SDP) Offer/Answer Clarifications                        for RTP/RTCP Multiplexing


   This document updates RFC 5761 by clarifying the SDP offer/answer    negotiation of RTP and RTP Control Protocol (RTCP) multiplexing.  It    makes it clear that an answerer can only include an "a=rtcp-mux"    attribute in a Session Description Protocol (SDP) answer if the    associated SDP offer contained the attribute.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

 Holmberg                     Standards Track                    [Page 1]
 RFC 8035               RTP/RTCP Mux Clarifications         November 2016

 Copyright Notice

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