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