Session Description Protocol (SDP) Offer/Answer procedures for Interactive Connectivity Establishment (ICE)
draft-ietf-mmusic-ice-sip-sdp-36

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 00
• 01
• 02
• 03
• 04
• 05
• 06
• 07
• 08
• 09
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36

MMUSIC                                                 M. Petit-Huguenin
Internet-Draft                                        Impedance Mismatch
Obsoletes: 5245 (if approved)                              S. Nandakumar
Intended status: Standards Track                           Cisco Systems
Expires: December 8, 2019                                     A. Keranen
                                                                Ericsson
                                                            June 6, 2019

     Session Description Protocol (SDP) Offer/Answer procedures for
              Interactive Connectivity Establishment (ICE)
                    draft-ietf-mmusic-ice-sip-sdp-36

Abstract

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

   This document obsoletes RFC 5245.

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."

   This Internet-Draft will expire on December 8, 2019.

Copyright Notice

   Copyright (c) 2019 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

Petit-Huguenin, et al.  Expires December 8, 2019                [Page 1]
Internet-Draft                ICE SDP Usage                    June 2019

   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  SDP Offer/Answer Procedures . . . . . . . . . . . . . . . . .   4
     3.1.  Introduction  . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Generic Procedures  . . . . . . . . . . . . . . . . . . .   4
       3.2.1.  Encoding  . . . . . . . . . . . . . . . . . . . . . .   4
       3.2.2.  RTP/RTCP Considerations . . . . . . . . . . . . . . .   6
       3.2.3.  Determining Role  . . . . . . . . . . . . . . . . . .   6
       3.2.4.  STUN Considerations . . . . . . . . . . . . . . . . .   6
       3.2.5.  Verifying ICE Support Procedures  . . . . . . . . . .   6
       3.2.6.  SDP Example . . . . . . . . . . . . . . . . . . . . .   7
     3.3.  Initial Offer/Answer Exchange . . . . . . . . . . . . . .   8
       3.3.1.  Sending the Initial Offer . . . . . . . . . . . . . .   8
       3.3.2.  Sending the Initial Answer  . . . . . . . . . . . . .   8
       3.3.3.  Receiving the Initial Answer  . . . . . . . . . . . .   9
       3.3.4.  Concluding ICE  . . . . . . . . . . . . . . . . . . .  10
     3.4.  Subsequent Offer/Answer Exchanges . . . . . . . . . . . .  10
       3.4.1.  Sending Subsequent Offer  . . . . . . . . . . . . . .  11
       3.4.2.  Sending Subsequent Answer . . . . . . . . . . . . . .  13
       3.4.3.  Receiving Answer for a Subsequent Offer . . . . . . .  15
   4.  Grammar . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
     4.1.  "candidate" Attribute . . . . . . . . . . . . . . . . . .  17
     4.2.  "remote-candidates" Attribute . . . . . . . . . . . . . .  19
     4.3.  "ice-lite" and "ice-mismatch" Attributes  . . . . . . . .  20
     4.4.  "ice-ufrag" and "ice-pwd" Attributes  . . . . . . . . . .  20