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
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EDIT |
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.
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 https://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."
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.
Copyright Notice
Copyright (c) 2018 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
(https://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
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
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
4.4. 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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