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The Session Description Protocol (SDP) Content Attribute (RFC4796)

IP.com Disclosure Number: IPCOM000146280D
Original Publication Date: 2007-Feb-01
Included in the Prior Art Database: 2007-Feb-09
Document File: 12 page(s) / 23K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Hautakorpi: AUTHOR [+2]

Abstract

This document defines a new Session Description Protocol (SDP) media- level attribute, 'content'. The 'content' attribute defines the content of the media stream to a more detailed level than the media description line. The sender of an SDP session description can attach the 'content' attribute to one or more media streams. The receiving application can then treat each media stream differently (e.g., show it on a big or small screen) based on its content.

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Network Working Group                                      J. Hautakorpi Request for Comments: 4796                                  G. Camarillo Category: Standards Track                                       Ericsson                                                            February 2007

         The Session Description Protocol (SDP) Content Attribute

Status of This Memo

   This document specifies an Internet standards track protocol for the    Internet community, and requests discussion and suggestions for    improvements.  Please refer to the current edition of the "Internet    Official Protocol Standards" (STD 1) for the standardization state    and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The IETF Trust (2007).

Abstract

   This document defines a new Session Description Protocol (SDP) media-    level attribute, 'content'.  The 'content' attribute defines the    content of the media stream to a more detailed level than the media    description line.  The sender of an SDP session description can    attach the 'content' attribute to one or more media streams.  The    receiving application can then treat each media stream differently    (e.g., show it on a big or small screen) based on its content.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2

   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  2

   3.  Related Techniques . . . . . . . . . . . . . . . . . . . . . .  2

   4.  Motivation for the New Content Attribute . . . . . . . . . . .  3

   5.  The Content Attribute  . . . . . . . . . . . . . . . . . . . .  4

   6.  The Content Attribute in the Offer/Answer Model  . . . . . . .  5

   7.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . . .  6

   8.  Operation with SMIL  . . . . . . . . . . . . . . . . . . . . .  7

   9.  Security Considerations  . . . . . . . . . . . . . . . . . . .  7

   10. IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  8

   11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  8

   12. References . . . . . . . . . . . . . . . . . . . . . . . . . .  9

     12.1.  Normative References  . . . . . . . . . . . . . . . . . .  9

     12.2.  Informational References  . . . . . . . . . . . . . . . .  9

Hautakorpi & Camarillo      Standards Track                     [Page 1]
 RFC 4796                   Content Attribute               February 2007

 1.  Introduction

   The Session Description Protocol (SDP) [1] is a protocol that is    intended to describe multimedia sessions for...