Session Description Protocol (SDP) Media Capabilities Negotiation
RFC 6871
| Document | Type |
RFC - Proposed Standard
(February 2013; No errata)
Updates RFC 5939
|
|
|---|---|---|---|
| Last updated | 2018-12-20 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Miguel García | ||
| Shepherd write-up | Show (last changed 2012-10-04) | ||
| IESG | IESG state | RFC 6871 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Gonzalo Camarillo | ||
| IESG note | Miguel Garcia (Miguel.A.Garcia@ericsson.com) is the Document Shepherd. | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) R. Gilman
Request for Comments: 6871 Independent
Updates: 5939 R. Even
Category: Standards Track Huawei Technologies
ISSN: 2070-1721 F. Andreasen
Cisco Systems
February 2013
Session Description Protocol (SDP) Media Capabilities Negotiation
Abstract
Session Description Protocol (SDP) capability negotiation provides a
general framework for indicating and negotiating capabilities in SDP.
The base framework defines only capabilities for negotiating
transport protocols and attributes. This documents extends the
framework by defining media capabilities that can be used to
negotiate media types and their associated parameters.
This document updates the IANA Considerations of RFC 5939.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6871.
Gilman, et al. Standards Track [Page 1]
RFC 6871 SDP Media Capabilities Negotiation February 2013
Copyright Notice
Copyright (c) 2013 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
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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
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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.
Gilman, et al. Standards Track [Page 2]
RFC 6871 SDP Media Capabilities Negotiation February 2013
Table of Contents
1. Introduction ....................................................4
2. Terminology .....................................................4
3. SDP Media Capabilities ..........................................6
3.1. Requirements ...............................................6
3.2. Solution Overview ..........................................7
3.3. New Capability Attributes .................................13
3.3.1. The Media Format Capability Attributes .............13
3.3.2. The Media Format Parameter Capability Attribute ....16
3.3.3. The Media-Specific Capability Attribute ............19
3.3.4. New Configuration Parameters .......................21
3.3.5. The Latent Configuration Attribute .................23
3.3.6. Enhanced Potential Configuration Attribute .........25
3.3.7. Substitution of Media Payload Type Numbers
in Capability ......................................29
3.3.8. The Session Capability Attribute ...................30
3.4. Offer/Answer Model Extensions .............................35
3.4.1. Generating the Initial Offer .......................35
3.4.2. Generating the Answer ..............................39
3.4.3. Offerer Processing of the Answer ...................43
3.4.4. Modifying the Session ..............................43
4. Examples .......................................................44
4.1. Alternative Codecs ........................................44
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