A Session Initiation Protocol (SIP) Usage for Incremental Provisioning of Candidates for the Interactive Connectivity Establishment (Trickle ICE)
draft-ietf-mmusic-trickle-ice-sip-18
Network Working Group E. Ivov
Internet-Draft Jitsi
Intended status: Standards Track T. Stach
Expires: December 24, 2018 Unaffiliated
E. Marocco
Telecom Italia
C. Holmberg
Ericsson
June 22, 2018
A Session Initiation Protocol (SIP) Usage for Incremental Provisioning
of Candidates for the Interactive Connectivity Establishment (Trickle
ICE)
draft-ietf-mmusic-trickle-ice-sip-18
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). The document also defines a new
SIP Info Package to support this usage together with the
corresponding media type. Additionally, a new SDP 'end-of-
candidates' attribute and a new SIP Option Tag 'trickle-ice' are
defined.
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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Task Force (IETF). Note that other groups may also distribute
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time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
Ivov, et al. Expires December 24, 2018 [Page 1]
Internet-Draft Trickle ICE for SIP June 2018
This Internet-Draft will expire on December 24, 2018.
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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
4.4. Delivering Candidates in INFO Requests . . . . . . . . . 16
5. Initial Discovery of Trickle ICE Support . . . . . . . . . . 20
5.1. Provisioning Support for Trickle ICE . . . . . . . . . . 20
5.2. Trickle ICE Discovery with Globally Routable User Agent
URIs (GRUU) . . . . . . . . . . . . . . . . . . . . . . . 20
5.3. Fall-back to Half Trickle . . . . . . . . . . . . . . . . 21
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