SDP-based Data Channel Negotiation
draft-ietf-mmusic-data-channel-sdpneg-28

Document Type Active Internet-Draft (mmusic WG)
Last updated 2019-08-20 (latest revision 2019-05-11)
Replaces draft-ejzak-mmusic-data-channel-sdpneg
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MMUSIC                                                          K. Drage
Internet-Draft                                              Unaffiliated
Intended status: Standards Track                             M. Makaraju
Expires: November 12, 2019                                         Nokia
                                                                R. Ejzak
                                                               J. Marcon
                                                            Unaffiliated
                                                            R. Even, Ed.
                                                                  Huawei
                                                            May 11, 2019

                   SDP-based Data Channel Negotiation
                draft-ietf-mmusic-data-channel-sdpneg-28

Abstract

   Data channel setup can be done using either the in-band Data Channel
   Establishment Protocol (DCEP) or using some out-of-band non-DCEP
   protocol.  This document specifies how the SDP (Session Description
   Protocol) offer/answer exchange can be used to achieve an out-of-band
   non-DCEP negotiation for establishing a data channel.

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
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   This Internet-Draft will expire on November 12, 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

Drage, et al.           Expires November 12, 2019               [Page 1]
Internet-Draft     SDP-based Data Channel Negotiation           May 2019

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Applicability Statement . . . . . . . . . . . . . . . . . . .   6
   5.  SDP Data Channel Attributes . . . . . . . . . . . . . . . . .   6
     5.1.  SDP DCMAP Attribute . . . . . . . . . . . . . . . . . . .   6
       5.1.1.  DCMAP Attribute Syntax  . . . . . . . . . . . . . . .   6
       5.1.2.  Dcmap-stream-id Parameter . . . . . . . . . . . . . .   8
       5.1.3.  Label Parameter . . . . . . . . . . . . . . . . . . .   8
       5.1.4.  Subprotocol Parameter . . . . . . . . . . . . . . . .   8
       5.1.5.  Max-retr Parameter  . . . . . . . . . . . . . . . . .   9
       5.1.6.  Max-time Parameter  . . . . . . . . . . . . . . . . .   9
       5.1.7.  Ordered Parameter . . . . . . . . . . . . . . . . . .   9
       5.1.8.  Priority Parameter  . . . . . . . . . . . . . . . . .  10
       5.1.9.  DCMAP Multiplexing Category . . . . . . . . . . . . .  10
     5.2.  SDP DCSA Attribute  . . . . . . . . . . . . . . . . . . .  10
       5.2.1.  DCSA Syntax . . . . . . . . . . . . . . . . . . . . .  11
       5.2.2.  DCSA Multiplexing Category  . . . . . . . . . . . . .  12
   6.  SDP Offer/Answer Procedures . . . . . . . . . . . . . . . . .  13
     6.1.  Managing Stream Identifiers . . . . . . . . . . . . . . .  13
     6.2.  Negotiating Data Channel Parameters . . . . . . . . . . .  13
     6.3.  Generating the Initial Offer for A Data Channel . . . . .  14
     6.4.  Generating SDP Answer . . . . . . . . . . . . . . . . . .  14
     6.5.  Offerer Processing of the SDP Answer  . . . . . . . . . .  15
     6.6.  Modifying the Session . . . . . . . . . . . . . . . . . .  15
       6.6.1.  Closing a Data Channel  . . . . . . . . . . . . . . .  16
     6.7.  Various SDP Offer/Answer Considerations . . . . . . . . .  16
   7.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .  17
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  19
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  20
     9.1.  Subprotocol Identifiers . . . . . . . . . . . . . . . . .  20
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