SDP-based Data Channel Negotiation
draft-ietf-mmusic-data-channel-sdpneg-07

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MMUSIC                                                     K. Drage, Ed.
Internet-Draft                                               M. Makaraju
Intended status: Standards Track                     J. Stoetzer-Bradler
Expires: June 2, 2016                                     Alcatel-Lucent
                                                                R. Ejzak
                                                               J. Marcon
                                                            Unaffiliated
                                                       November 30, 2015

                   SDP-based Data Channel Negotiation
                draft-ietf-mmusic-data-channel-sdpneg-07

Abstract

   The Real-Time Communication in WEB-browsers (RTCWeb) working group is
   charged to provide protocols to support direct interactive rich
   communications using audio, video, and data between two peers' web-
   browsers.  For the support of data communication, the RTCWeb working
   group has in particular defined the concept of bi-directional data
   channels over SCTP (Stream Control Transmission Protocol), where each
   data channel might be used to transport other protocols, called
   subprotocols.  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
   such an out-of-band non-DCEP negotiation.  Even though data channels
   are designed for RTCWeb use initially, they may be used by other
   protocols like, but not limited to, the CLUE protocol (which is
   defined by the IETF "ControLling mUltiple streams for tElepresence"
   working group).  This document is intended to be used wherever data
   channels are used.

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
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   Drafts is at http://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
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   material or to cite them other than as "work in progress."

Drage, et al.             Expires June 2, 2016                  [Page 1]
Internet-Draft     SDP-based Data Channel Negotiation      November 2015

   This Internet-Draft will expire on June 2, 2016.

Copyright Notice

   Copyright (c) 2015 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
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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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Applicability Statement . . . . . . . . . . . . . . . . . . .   5
   5.  SDP Offer/Answer Negotiation  . . . . . . . . . . . . . . . .   5
     5.1.  SDP Syntax  . . . . . . . . . . . . . . . . . . . . . . .   5
       5.1.1.  SDP Attribute for Data Channel Parameter Negotiation    5
         5.1.1.1.  dcmap Attribute . . . . . . . . . . . . . . . . .   6
         5.1.1.2.  dcmap Multiplexing Category . . . . . . . . . . .   7
         5.1.1.3.  dcmap-stream-id Parameter . . . . . . . . . . . .   8
         5.1.1.4.  label Parameter . . . . . . . . . . . . . . . . .   8
         5.1.1.5.  subprotocol Parameter . . . . . . . . . . . . . .   8
         5.1.1.6.  max-retr Parameter  . . . . . . . . . . . . . . .   8
         5.1.1.7.  max-time Parameter  . . . . . . . . . . . . . . .   9
         5.1.1.8.  ordered Parameter . . . . . . . . . . . . . . . .   9
         5.1.1.9.  priority Parameter  . . . . . . . . . . . . . . .   9
       5.1.2.  Other Media Level Attributes  . . . . . . . . . . . .   9
         5.1.2.1.  dcsa Attribute  . . . . . . . . . . . . . . . . .  10
         5.1.2.2.  dcsa Multiplexing Category  . . . . . . . . . . .  11
     5.2.  Procedures  . . . . . . . . . . . . . . . . . . . . . . .  11
       5.2.1.  Managing Stream Identifiers . . . . . . . . . . . . .  11
       5.2.2.  Negotiating Data Channel Parameters . . . . . . . . .  12