Javascript Session Establishment Protocol
draft-ietf-rtcweb-jsep-06

Network Working Group                                          J. Uberti
Internet-Draft                                                    Google
Intended status: Standards Track                             C. Jennings
Expires: August 17, 2014                                           Cisco
                                                       February 13, 2014

               Javascript Session Establishment Protocol
                       draft-ietf-rtcweb-jsep-06

Abstract

   This document describes the mechanisms for allowing a Javascript
   application to 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 17, 2014                [Page 1]
Internet-Draft                    JSEP                     February 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  General Design of JSEP  . . . . . . . . . . . . . . . . .   3
     1.2.  Other Approaches Considered . . . . . . . . . . . . . . .   5
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Semantics and Syntax  . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Signaling Model . . . . . . . . . . . . . . . . . . . . .   6
     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
       3.4.2.  ICE Candidate Pool  . . . . . . . . . . . . . . . . .  11
     3.5.  Interactions With Forking . . . . . . . . . . . . . . . .  12
       3.5.1.  Sequential Forking  . . . . . . . . . . . . . . . . .  12
       3.5.2.  Parallel Forking  . . . . . . . . . . . . . . . . . .  13
     3.6.  Session Rehydration . . . . . . . . . . . . . . . . . . .  14
   4.  Interface . . . . . . . . . . . . . . . . . . . . . . . . . .  14
     4.1.  Methods . . . . . . . . . . . . . . . . . . . . . . . . .  14
       4.1.1.  Constructor . . . . . . . . . . . . . . . . . . . . .  14
       4.1.2.  createOffer . . . . . . . . . . . . . . . . . . . . .  15
       4.1.3.  createAnswer  . . . . . . . . . . . . . . . . . . . .  16
       4.1.4.  SessionDescriptionType  . . . . . . . . . . . . . . .  17
         4.1.4.1.  Use of Provisional Answers  . . . . . . . . . . .  18
         4.1.4.2.  Rollback  . . . . . . . . . . . . . . . . . . . .  18
       4.1.5.  setLocalDescription . . . . . . . . . . . . . . . . .  19
       4.1.6.  setRemoteDescription  . . . . . . . . . . . . . . . .  20
       4.1.7.  localDescription  . . . . . . . . . . . . . . . . . .  20
       4.1.8.  remoteDescription . . . . . . . . . . . . . . . . . .  20
       4.1.9.  updateIce . . . . . . . . . . . . . . . . . . . . . .  20
       4.1.10. addIceCandidate . . . . . . . . . . . . . . . . . . .  21
   5.  SDP Interaction Procedures  . . . . . . . . . . . . . . . . .  21
     5.1.  Requirements Overview . . . . . . . . . . . . . . . . . .  21
       5.1.1.  Implementation Requirements . . . . . . . . . . . . .  21
       5.1.2.  Usage Requirements  . . . . . . . . . . . . . . . . .  23
     5.2.  Constructing an Offer . . . . . . . . . . . . . . . . . .  23