Indicating Support for Interactive Connectivity Establishment (ICE) in the Session Initiation Protocol (SIP)
RFC 5768

 
Document Type RFC - Proposed Standard (April 2010; No errata)
Last updated 2013-03-02
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IESG IESG state RFC 5768 (Proposed Standard)
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Responsible AD Cullen Jennings
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Internet Engineering Task Force (IETF)                      J. Rosenberg
Request for Comments: 5768                                   jdrosen.net
Category: Standards Track                                     April 2010
ISSN: 2070-1721

  Indicating Support for Interactive Connectivity Establishment (ICE)
                in the Session Initiation Protocol (SIP)

Abstract

   This specification defines a media feature tag and an option tag for
   use with the Session Initiation Protocol (SIP).  The media feature
   tag allows a User Agent (UA) to communicate to its registrar that it
   supports ICE.  The option tag allows a UA to require support for ICE
   in order for a call to proceed.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5768.

Copyright Notice

   Copyright (c) 2010 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
   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.

Rosenberg                    Standards Track                    [Page 1]
RFC 5768                       ICE Support                    April 2010

Table of Contents

   1. Introduction ....................................................2
   2. Terminology .....................................................2
   3. Motivation ......................................................3
      3.1. Gateways ...................................................3
      3.2. Mandating Support for ICE ..................................3
   4. Media Feature Tag Definition ....................................3
   5. Option Tag Definition ...........................................4
   6. Security Considerations .........................................4
   7. IANA Considerations .............................................4
      7.1. Option Tag .................................................4
      7.2. Media Feature Tag ..........................................5
   8. References ......................................................5
      8.1. Normative References .......................................5
      8.2. Informative References .....................................6

1.  Introduction

   RFC 3264 [RFC3264] defines a two-phase exchange of Session
   Description Protocol (SDP) [RFC4566] messages for the purposes of
   establishment of multimedia sessions.  This offer/answer mechanism is
   used by protocols such as the Session Initiation Protocol (SIP)
   [RFC3261].

   Protocols using offer/answer are difficult to operate through Network
   Address Translators (NAT).  Because their purpose is to establish a
   flow of media packets, they tend to carry IP addresses within their
   messages, which is known to be problematic through NAT [RFC3235].  To
   remedy this, an extension to SDP, called Interactive Connectivity
   Establishment (ICE) has been defined [RFC5245].  ICE defines
   procedures by which agents gather a multiplicity of addresses,
   include all of them in an SDP offer or answer, and then use peer-to-
   peer Session Traversal Utilities for NAT (STUN) [RFC5389]
   connectivity checks to determine a valid address.

   This specification defines a media feature tag, "sip.ice", and a SIP
   option tag, "ice", that can be used by SIP User Agents that make use
   of ICE.  Section 3 motivates the need for the media feature tag and
   option tag, and Section 4 and Section 5 formally define them.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Rosenberg                    Standards Track                    [Page 2]
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