A Session Initiation Protocol (SIP) usage for Trickle ICE
draft-ietf-mmusic-trickle-ice-sip-12

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Document Type Active Internet-Draft (mmusic WG)
Last updated 2018-02-08 (latest revision 2017-12-22)
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Network Working Group                                            E. Ivov
Internet-Draft                                                     Jitsi
Intended status: Standards Track                                T. Stach
Expires: June 25, 2018                                      Unaffiliated
                                                              E. Marocco
                                                          Telecom Italia
                                                             C. Holmberg
                                                                Ericsson
                                                       December 22, 2017

       A Session Initiation Protocol (SIP) usage for Trickle ICE
                  draft-ietf-mmusic-trickle-ice-sip-12

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) and defines a new SIP Info Package.

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
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   This Internet-Draft will expire on June 25, 2018.

Ivov, et al.              Expires June 25, 2018                 [Page 1]
Internet-Draft             Trickle ICE for SIP             December 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
   Provisions Relating to IETF Documents
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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 . . . . . . . . . . .   7
     4.1.  Initial Offer/Answer exchange . . . . . . . . . . . . . .   8
       4.1.1.  Sending the initial Offer . . . . . . . . . . . . . .   8
       4.1.2.  Receiving the initial Offer . . . . . . . . . . . . .   9
       4.1.3.  Sending the initial Answer  . . . . . . . . . . . . .   9
       4.1.4.  Receiving the initial Answer  . . . . . . . . . . . .  10
     4.2.  Subsequent Offer/Answer exchanges . . . . . . . . . . . .  10
     4.3.  Establishing the dialog . . . . . . . . . . . . . . . . .  10
       4.3.1.  Establishing dialog state through reliable
               Offer/Answer delivery . . . . . . . . . . . . . . . .  11
       4.3.2.  Establishing dialog state through unreliable
               Offer/Answer delivery . . . . . . . . . . . . . . . .  12
       4.3.3.  Initiating Trickle ICE without an SDP Answer  . . . .  14
       4.3.4.  Considerations for Third Party Call Control . . . . .  15
     4.4.  Delivering candidates in INFO messages  . . . . . . . . .  17
   5.  Initial discovery of Trickle ICE support  . . . . . . . . . .  21
     5.1.  Provisioning support for Trickle ICE  . . . . . . . . . .  22
     5.2.  Trickle ICE discovery with Globally Routable User Agent
           URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .  22
     5.3.  Fall-back to Half Trickle . . . . . . . . . . . . . . . .  23
   6.  Considerations for RTP and RTCP multiplexing  . . . . . . . .  24
   7.  Considerations for Media Multiplexing . . . . . . . . . . . .  26
   8.  SDP 'end-of-candidate' Attribute  . . . . . . . . . . . . . .  29
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