Session Description Protocol (SDP) Offer/Answer Clarifications for RTP/RTCP Multiplexing (RFC8035)
Original Publication Date: 2016-Nov-01
Included in the Prior Art Database: 2016-Nov-29
Internet Society Requests For Comment (RFCs)
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.
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 http://www.rfc-editor.org/info/rfc8035.
Holmberg Standards Track [Page 1]
RFC 8035 RTP/RTCP Mux Clarifications November 2016
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