A Session Initiation Protocol (SIP) usage for Trickle ICE
draft-ietf-mmusic-trickle-ice-sip-07

Document Type Active Internet-Draft (mmusic WG)
Last updated 2017-03-03
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Network Working Group                                            E. Ivov
Internet-Draft                                                     Jitsi
Intended status: Standards Track                                T. Stach
Expires: September 4, 2017                                  Unaffiliated
                                                              E. Marocco
                                                          Telecom Italia
                                                             C. Holmberg
                                                                Ericsson
                                                           March 3, 2017

       A Session Initiation Protocol (SIP) usage for Trickle ICE
                  draft-ietf-mmusic-trickle-ice-sip-07

Abstract

   The Interactive Connectivity Establishment (ICE) protocol describes a
   Network Address Translator (NAT) traversal mechanism for UDP-based
   multimedia sessions established with the Offer/Answer model.  The ICE
   extension for Incremental Provisioning of Candidates (Trickle ICE)
   defines a mechanism that allows ICE agents to shorten session
   establishment delays by making the candidate gathering and
   connectivity checking phases of ICE non-blocking and by executing
   them in parallel.

   This document defines usage semantics for Trickle ICE with the
   Session Initiation Protocol (SIP).

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 September 4, 2017.

Ivov, et al.            Expires September 4, 2017               [Page 1]
Internet-Draft             Trickle ICE for SIP                March 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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Discovery issues  . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Relationship with the Offer/Answer Model  . . . . . . . .   6
   4.  Incremental Signaling of ICE candidates . . . . . . . . . . .   8
     4.1.  Establishing the dialog . . . . . . . . . . . . . . . . .   8
       4.1.1.  Asserting dialog state through reliable Offer/Answer
               delivery  . . . . . . . . . . . . . . . . . . . . . .   8
       4.1.2.  Asserting dialog state through unreliable
               Offer/Answer delivery . . . . . . . . . . . . . . . .   9
       4.1.3.  Initiating Trickle ICE without an SDP Answer  . . . .  11
       4.1.4.  Considerations for 3PCC . . . . . . . . . . . . . . .  12
     4.2.  Delivering candidates in INFO messages  . . . . . . . . .  14
   5.  Initial discovery of Trickle ICE support  . . . . . . . . . .  17
     5.1.  Provisioning support for Trickle ICE  . . . . . . . . . .  17
     5.2.  Trickle ICE discovery with GRUU . . . . . . . . . . . . .  18
     5.3.  Trickle ICE discovery through other protocols . . . . . .  19
     5.4.  Fall-back to Half Trickle . . . . . . . . . . . . . . . .  19
   6.  Considerations for RTP and RTCP multiplexing  . . . . . . . .  21
   7.  Considerations for Media Multiplexing . . . . . . . . . . . .  22
   8.  SDP 'end-of-candidate' Attribute  . . . . . . . . . . . . . .  25
   9.  Content Type 'application/trickle-ice-sdpfrag'  . . . . . . .  25
     9.1.  Overall Description . . . . . . . . . . . . . . . . . . .  25
     9.2.  Grammar . . . . . . . . . . . . . . . . . . . . . . . . .  26
   10. Info Package  . . . . . . . . . . . . . . . . . . . . . . . .  27
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