Using Partial Offers and Partial Answers in a Multimedia Session
draft-roach-mmusic-pof-pan-01

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Network Working Group                                        A. B. Roach
Internet-Draft                                                   Mozilla
Updates: 3264 (if approved)                                S. Nandakumar
Intended status: Standards Track                                   Cisco
Expires: April 20, 2014                                 October 17, 2013

    Using Partial Offers and Partial Answers in a Multimedia Session
                     draft-roach-mmusic-pof-pan-01

Abstract

   Whenever two hosts have the ability to set up and control a session
   on a peer-to-peer basis, situations can arise in which both parties
   attempt to change session parameters "at the same time," such that
   the session control messages cross on the wire.  When this happens,
   implementations need to invoke extraordinary procedures to return the
   shared state of the session to a common view between the endpoints.

   For real-time communications, these session control messages are
   typically exchanged using the session description protocol (SDP),
   using an Offer/Answer model.  This document expands the offer/answer
   model to include the ability to exchange information relating to
   discrete media streams within the session.  By reducing the amount of
   session data, the frequency of session state conflicts can be
   reduced; and, for certain types of operations, conflicts can be
   eliminated altogether.

   This document updates RFC 3264.

Status of This Memo

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

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   This Internet-Draft will expire on April 20, 2014.

Roach & Nandakumar       Expires April 20, 2014                 [Page 1]
Internet-Draft         Partial Offers and Answers           October 2013

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Mechanism Overview  . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Adding a Stream . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Changing a Stream . . . . . . . . . . . . . . . . . . . .   5
     3.3.  Removing a Stream . . . . . . . . . . . . . . . . . . . .   6
   4.  Use With Other Protocols  . . . . . . . . . . . . . . . . . .   6
     4.1.  High-Level Sketch: Use With JSEP/WebRTC . . . . . . . . .   7
     4.2.  High-Level Sketch: Use With SIP . . . . . . . . . . . . .   7
   5.  Protocol Operation  . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Common Procedures . . . . . . . . . . . . . . . . . . . .   8
     5.2.  Generating a Partial Offer  . . . . . . . . . . . . . . .   8
     5.3.  Processing a Partial Offer  . . . . . . . . . . . . . . .   9
     5.4.  Processing a Partial Answer . . . . . . . . . . . . . . .  11
     5.5.  Updating the Shared View of Session State . . . . . . . .  12
     5.6.  Receiving a Full Offer with a Partial Offer Pending . . .  12
   6.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .  13
     6.1.  Adding Streams  . . . . . . . . . . . . . . . . . . . . .  14
       6.1.1.  Full Offer/Answer Procedures  . . . . . . . . . . . .  14
       6.1.2.  Partial Offer/Answer Procedures . . . . . . . . . . .  15
     6.2.  Removing Streams  . . . . . . . . . . . . . . . . . . . .  18
       6.2.1.  Full Offer/Answer Procedures  . . . . . . . . . . . .  18
       6.2.2.  Partial Offer/Answer Procedures . . . . . . . . . . .  19
     6.3.  Changing a Stream . . . . . . . . . . . . . . . . . . . .  21
       6.3.1.  Full Offer/Answer Procedures  . . . . . . . . . . . .  21
       6.3.2.  Partial Offer/Answer Procedures . . . . . . . . . . .  22
     6.4.  Both Sides Simultaneously Add Streams . . . . . . . . . .  24
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