A Session Initiation Protocol (SIP) usage for Trickle ICE
draft-ietf-mmusic-trickle-ice-sip-07
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Active Internet-Draft (mmusic WG)
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2017-03-03
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Flemming Andreasen
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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.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
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
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
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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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