Session Description Protocol (SDP) Offer/Answer Procedures for Interactive Connectivity Establishment (ICE)
RFC 8839
Document Type RFC - Proposed Standard (January 2021; No errata)
Obsoletes RFC 5245, RFC 6336
Authors Marc Petit-Huguenin  , Suhas Nandakumar  , Christer Holmberg  , Ari Keränen  , Roman Shpount
Last updated 2021-01-18
Replaces draft-petithuguenin-mmusic-ice-sip-sdp
Stream IETF
Formats plain text html xml pdf htmlized bibtex
Reviews
GENART Last Call Review (of -36): Ready with Nits
Stream WG state Submitted to IESG for Publication
Document shepherd Flemming Andreasen
Shepherd write-up Show (last changed 2019-06-06)
IESG IESG state RFC 8839 (Proposed Standard)
Action Holders
(None)
Consensus Boilerplate Yes
Telechat date
Responsible AD Adam Roach
Send notices to (None)
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Email authors Email WG IPR 1 References Referenced by Nits 


Internet Engineering Task Force (IETF)                 M. Petit-Huguenin
Request for Comments: 8839                            Impedance Mismatch
Obsoletes: 5245, 6336                                      S. Nandakumar
Category: Standards Track                                  Cisco Systems
ISSN: 2070-1721                                              C. Holmberg
                                                              A. Keränen
                                                                Ericsson
                                                              R. Shpount
                                                             TurboBridge
                                                            January 2021

     Session Description Protocol (SDP) Offer/Answer Procedures for
              Interactive Connectivity Establishment (ICE)

Abstract

   This document describes Session Description Protocol (SDP) Offer/
   Answer procedures for carrying out Interactive Connectivity
   Establishment (ICE) between the agents.

   This document obsoletes RFCs 5245 and 6336.

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 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8839.

Copyright Notice

   Copyright (c) 2021 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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1.  Introduction
   2.  Conventions
   3.  Terminology
   4.  SDP Offer/Answer Procedures
     4.1.  Introduction
     4.2.  Generic Procedures
       4.2.1.  Encoding
       4.2.2.  RTP/RTCP Considerations
       4.2.3.  Determining Role
       4.2.4.  STUN Considerations
       4.2.5.  Verifying ICE Support Procedures
       4.2.6.  SDP Example
     4.3.  Initial Offer/Answer Exchange
       4.3.1.  Sending the Initial Offer
       4.3.2.  Sending the Initial Answer
       4.3.3.  Receiving the Initial Answer
       4.3.4.  Concluding ICE
     4.4.  Subsequent Offer/Answer Exchanges
       4.4.1.  Sending Subsequent Offer
       4.4.2.  Sending Subsequent Answer
       4.4.3.  Receiving Answer for a Subsequent Offer
   5.  Grammar
     5.1.  "candidate" Attribute
     5.2.  "remote-candidates" Attribute
     5.3.  "ice-lite" and "ice-mismatch" Attributes
     5.4.  "ice-ufrag" and "ice-pwd" Attributes
     5.5.  "ice-pacing" Attribute
     5.6.  "ice-options" Attribute
   6.  Keepalives
   7.  SIP Considerations
     7.1.  Latency Guidelines
       7.1.1.  Offer in INVITE
       7.1.2.  Offer in Response
     7.2.  SIP Option Tags and Media Feature Tags
     7.3.  Interactions with Forking
     7.4.  Interactions with Preconditions
     7.5.  Interactions with Third Party Call Control
   8.  Interactions with Application Layer Gateways and SIP
   9.  Security Considerations
     9.1.  IP Address Privacy
     9.2.  Attacks on the Offer/Answer Exchanges
     9.3.  The Voice Hammer Attack
   10. IANA Considerations
     10.1.  SDP Attributes
       10.1.1.  "candidate" Attribute
       10.1.2.  "remote-candidates" Attribute
       10.1.3.  "ice-lite" Attribute
       10.1.4.  "ice-mismatch" Attribute
       10.1.5.  "ice-pwd" Attribute
       10.1.6.  "ice-ufrag" Attribute
       10.1.7.  "ice-options" Attribute
       10.1.8.  "ice-pacing" Attribute
     10.2.  Interactive Connectivity Establishment (ICE) Options
Show full document text
RFC Editor IASA & IETF LLC IETF Trust IRTF IETF IESG IAB IANA Privacy Statement IETF Tools