Indicating Exclusive Support of RTP/RTCP Multiplexing using SDP
draft-ietf-mmusic-mux-exclusive-11

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Network Working Group                                        C. Holmberg
Internet-Draft                                                  Ericsson
Updates: 5761 (if approved)                            February 17, 2017
Intended status: Standards Track
Expires: August 21, 2017

    Indicating Exclusive Support of RTP/RTCP Multiplexing using SDP
                 draft-ietf-mmusic-mux-exclusive-11.txt

Abstract

   This document defines a new SDP media-level attribute, 'rtcp-mux-
   only', that can be used by an endpoint to indicate exclusive support
   of RTP/RTCP multiplexing.  The document also updates RFC 5761, by
   clarifying that an offerer can use a mechanism to indicate that it is
   not able to send and receive RTCP on separate ports.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 21, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   include Simplified BSD License text as described in Section 4.e of

Holmberg                 Expires August 21, 2017                [Page 1]
Internet-Draft           Exclusive RTP/RTCP Mux            February 2017

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  SDP rtcp-mux-only Attribute . . . . . . . . . . . . . . . . .   3
   4.  SDP Offer/Answer Procedures . . . . . . . . . . . . . . . . .   5
     4.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Generating the Initial SDP Offer  . . . . . . . . . . . .   5
     4.3.  Generating the Answer . . . . . . . . . . . . . . . . . .   5
     4.4.  Offerer Processing of the SDP Answer  . . . . . . . . . .   6
     4.5.  Modifying the Session . . . . . . . . . . . . . . . . . .   6
   5.  Update to RFC 5761  . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.2.  Update to 4th paragraph of section 5.1.1  . . . . . . . .   7
     5.3.  Update to 2nd paragraph of section 5.1.3  . . . . . . . .   8
   6.  ICE Considerations  . . . . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   10. Change Log  . . . . . . . . . . . . . . . . . . . . . . . . .   9
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     11.2.  Informative References . . . . . . . . . . . . . . . . .  12
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   [RFC5761] defines how to multiplex RTP and RTCP on a single IP
   address and port, referred to as RTP/RTCP multiplexing.  [RFC5761]
   also defines an Session Description Protocol (SDP) [RFC4566]
   attribute, 'rtcp-mux' that can be used by entities to indicate
   support, and negotiate usage of, RTP/RTCP multiplexing.

   As defined in [RFC5761], if the peer endpoint does not support RTP/
   RTCP multiplexing, both endpoints should use separate ports for
   sending and receiving of RTCP (referred to as fallback to usage of
   separate ports for RTP and RTCP).

   Some newer applications that do not require backward compatibility
   with peers that cannot multiplex RTCP might choose to not implement
   separation of RTP and RTCP.  Examples of such applications are W3C
   WEBRTC [W3C.WD-webrtc-20120209] applications, that are not required
   to interoperate with non-WEBRTC clients.  For such applications, this