Stream Control Transmission Protocol (SCTP)-Based Media Transport in the Session Description Protocol (SDP)
draft-ietf-mmusic-sctp-sdp-03

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MMUSIC                                                         S. Loreto
Internet-Draft                                              G. Camarillo
Intended status: Standards Track                                Ericsson
Expires: July 25, 2013                                  January 21, 2013

Stream Control Transmission Protocol (SCTP)-Based Media Transport in the
                   Session Description Protocol (SDP)
                     draft-ietf-mmusic-sctp-sdp-03

Abstract

   SCTP (Stream Control Transmission Protocol) is a transport protocol
   used to establish associations between two endpoints.  This document
   describes how to express media transport over SCTP in SDP (Session
   Description Protocol).  This document defines the 'SCTP', 'SCTP/DTLS'
   and 'DTLS/SCTP' protocol identifiers for SDP.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on July 25, 2013.

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   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Protocol Identifier  . . . . . . . . . . . . . . . . . . . . .  4
   4.  Media Formats  . . . . . . . . . . . . . . . . . . . . . . . .  4
     4.1.  datachannels and m-line  . . . . . . . . . . . . . . . . .  5
     4.2.  Media Descriptions . . . . . . . . . . . . . . . . . . . .  5
     4.3.  Predefinition of Data Channels . . . . . . . . . . . . . .  6
   5.  Media attributes . . . . . . . . . . . . . . . . . . . . . . .  7
     5.1.  sctpmap Attribute  . . . . . . . . . . . . . . . . . . . .  7
     5.2.  stream Attribute . . . . . . . . . . . . . . . . . . . . .  7
     5.3.  label Attribute  . . . . . . . . . . . . . . . . . . . . .  8
     5.4.  subprotocol Attribute  . . . . . . . . . . . . . . . . . .  8
     5.5.  max_retr Attribute . . . . . . . . . . . . . . . . . . . .  8
     5.6.  max_time Attribute . . . . . . . . . . . . . . . . . . . .  8
     5.7.  unordered Attribute  . . . . . . . . . . . . . . . . . . .  9
   6.  The Setup and Connection Attributes and Association
       Management . . . . . . . . . . . . . . . . . . . . . . . . . .  9
   7.  Multihoming  . . . . . . . . . . . . . . . . . . . . . . . . .  9
   8.  Network Address Translation (NAT) Considerations . . . . . . . 10
   9.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     9.1.  Actpass/Passive  . . . . . . . . . . . . . . . . . . . . . 10
     9.2.  Existing Connection Reuse  . . . . . . . . . . . . . . . . 11
     9.3.  SDP description for DTLS Connection  . . . . . . . . . . . 12
   10. Security Considerations  . . . . . . . . . . . . . . . . . . . 12
   11. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
   12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
     12.1. Normative References . . . . . . . . . . . . . . . . . . . 13
     12.2. Informative References . . . . . . . . . . . . . . . . . . 14
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14

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1.  Introduction

   SDP (Session Description Protocol) [RFC4566] provides a general-
   purpose format for describing multimedia sessions in announcements or
   invitations.  RFC4145 [RFC4145] specifies a general mechanism for
   describing and establishing TCP (Transmission Control Protocol)
   streams.  RFC 4572 [RFC4572] extends RFC4145 [RFC4145] for describing
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