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Negotiating Media Multiplexing Using the Session Description Protocol (SDP)
draft-ietf-mmusic-sdp-bundle-negotiation-12

Document type: Active Internet-Draft (mmusic WG)
Document stream: IETF
Last updated: 2014-10-09
Intended RFC status: Unknown
Other versions: plain text, xml, pdf, html

IETF State: WG Document Nov 2014
Document shepherd: Flemming Andreasen

IESG State: I-D Exists
Responsible AD: (None)
Send notices to: No addresses provided

MMUSIC Working Group                                         C. Holmberg
Internet-Draft                                                  Ericsson
Updates: 3264 (if approved)                                H. Alvestrand
Intended status: Standards Track                                  Google
Expires: April 12, 2015                                      C. Jennings
                                                                   Cisco
                                                         October 9, 2014

 Negotiating Media Multiplexing Using the Session Description Protocol
                                 (SDP)
            draft-ietf-mmusic-sdp-bundle-negotiation-12.txt

Abstract

   This specification defines a new SDP Grouping Framework extension,
   'BUNDLE'.  The extension can be used with the Session Description
   Protocol (SDP) Offer/Answer mechanism to negotiate the usage of a
   single 5-tuple for sending and receiving media associated with
   multiple SDP media descriptions ("m=").  This is referred to as
   bundled media.

   Both endpoints can negotiate the use of bundle and to support that
   negotiations, this specification defines a new SDP attribute,
   'bundle-only', which can be used to request that specific media is
   only used if bundled.  This specification also updates sections 5.1,
   8.1 and 8.2 of RFC 3264 to allows an answerer to assign a non-zero
   port value to an "m=" line in an SDP answer, even if the "m=" line in
   the associated SDP offer contained a zero port value.

   There are multiple ways to correlate the bundled RTP packets with the
   appropriate media descriptions.  This specification defines a new RTP
   SDES item and a new RTP header extension that provides an additional
   way to do this correlation by using them to carry a value that
   associates the RTP/RTCP packets with a specific media description.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any

Holmberg, et al.         Expires April 12, 2015                 [Page 1]
Internet-Draft                Bundled media                 October 2014

   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 April 12, 2015.

Copyright Notice

   Copyright (c) 2014 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Applicability Statement . . . . . . . . . . . . . . . . . . .   6
   5.  SDP Grouping Framework BUNDLE Extension . . . . . . . . . . .   7
     5.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  SDP 'bundle-only' Attribute . . . . . . . . . . . . . . . . .   7
     6.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.2.  Syntax  . . . . . . . . . . . . . . . . . . . . . . . . .   8
   7.  SDP Information Considerations  . . . . . . . . . . . . . . .   8
     7.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   8
     7.2.  Connection Data (c=)  . . . . . . . . . . . . . . . . . .   8
     7.3.  Bandwidth (b=)  . . . . . . . . . . . . . . . . . . . . .   8
     7.4.  Attributes (a=) . . . . . . . . . . . . . . . . . . . . .   9
   8.  SDP Offer/Answer Procedures . . . . . . . . . . . . . . . . .   9
     8.1.  General . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.2.  Generating the Initial SDP Offer  . . . . . . . . . . . .  10
       8.2.1.  General . . . . . . . . . . . . . . . . . . . . . . .  10

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