Javascript Session Establishment Protocol
draft-ietf-rtcweb-jsep-03

Network Working Group                                          J. Uberti
Internet-Draft                                                    Google
Intended status:  Standards Track                            C. Jennings
Expires:  August 29, 2013                                          Cisco
                                                       February 25, 2013

               Javascript Session Establishment Protocol
                       draft-ietf-rtcweb-jsep-03

Abstract

   This document describes the mechanisms for allowing a Javascript
   application to fully control the signaling plane of a multimedia
   session via the interface specified in the W3C RTCPeerConnection API,
   and discusses how this relates to existing signaling protocols.

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Uberti & Jennings        Expires August 29, 2013                [Page 1]
Internet-Draft                    JSEP                     February 2013

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  General Design of JSEP . . . . . . . . . . . . . . . . . .  4
     1.2.  Other Approaches Considered  . . . . . . . . . . . . . . .  6
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  6
   3.  Semantics and Syntax . . . . . . . . . . . . . . . . . . . . .  7
     3.1.  Signaling Model  . . . . . . . . . . . . . . . . . . . . .  7
     3.2.  Session Descriptions and State Machine . . . . . . . . . .  7
     3.3.  Session Description Format . . . . . . . . . . . . . . . . 10
     3.4.  ICE  . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
       3.4.1.  ICE Candidate Trickling  . . . . . . . . . . . . . . . 10
         3.4.1.1.  ICE Candidate Format . . . . . . . . . . . . . . . 11
     3.5.  Interactions With Forking  . . . . . . . . . . . . . . . . 11
       3.5.1.  Sequential Forking . . . . . . . . . . . . . . . . . . 12
       3.5.2.  Parallel Forking . . . . . . . . . . . . . . . . . . . 12
     3.6.  Session Rehydration  . . . . . . . . . . . . . . . . . . . 13
   4.  Interface  . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     4.1.  SDP Requirements . . . . . . . . . . . . . . . . . . . . . 14
     4.2.  Methods  . . . . . . . . . . . . . . . . . . . . . . . . . 15
       4.2.1.  createOffer  . . . . . . . . . . . . . . . . . . . . . 15
       4.2.2.  createAnswer . . . . . . . . . . . . . . . . . . . . . 16
       4.2.3.  SessionDescriptionType . . . . . . . . . . . . . . . . 17
         4.2.3.1.  Use of Provisional Answers . . . . . . . . . . . . 18
         4.2.3.2.  Rollback . . . . . . . . . . . . . . . . . . . . . 18
       4.2.4.  setLocalDescription  . . . . . . . . . . . . . . . . . 19
       4.2.5.  setRemoteDescription . . . . . . . . . . . . . . . . . 19
       4.2.6.  localDescription . . . . . . . . . . . . . . . . . . . 20
       4.2.7.  remoteDescription  . . . . . . . . . . . . . . . . . . 20
       4.2.8.  updateIce  . . . . . . . . . . . . . . . . . . . . . . 20
       4.2.9.  addIceCandidate  . . . . . . . . . . . . . . . . . . . 21
   5.  SDP Interaction Procedures . . . . . . . . . . . . . . . . . . 21
     5.1.  Constructing an Offer  . . . . . . . . . . . . . . . . . . 21
     5.2.  Generating an Answer . . . . . . . . . . . . . . . . . . . 21
     5.3.  Parsing an Offer . . . . . . . . . . . . . . . . . . . . . 21
     5.4.  Parsing an Answer  . . . . . . . . . . . . . . . . . . . . 21
     5.5.  Applying a Local Description . . . . . . . . . . . . . . . 21