Miscellaneous Capabilities Negotiation in the Session Description Protocol (SDP)
draft-ietf-mmusic-sdp-miscellaneous-caps-03

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Replaces draft-garcia-mmusic-sdp-miscellaneous-caps
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MMUSIC WG                                               M. Garcia-Martin
Internet-Draft                                                  Ericsson
Intended status: Standards Track                         S. Veikkolainen
Expires: June 15, 2013                                             Nokia
                                                               R. Gilman
                                                       December 12, 2012

   Miscellaneous Capabilities Negotiation in the Session Description
                             Protocol (SDP)
              draft-ietf-mmusic-sdp-miscellaneous-caps-03

Abstract

   SDP has been extended with a capability negotiation mechanism
   framework that allows the endpoints to negotiate transport protocols
   and attributes.  This framework has been extended with a media
   capabilities negotiation mechanism that allows endpoints to negotiate
   additional media-related capabilities.  This negotiation is embedded
   into the widely-used SDP offer/answer procedures.

   This memo extends the SDP capability negotiation framework to allow
   endpoints to negotiate three additional SDP capabilities.  In
   particular, this memo provides a mechanism to negotiate bandwidth
   ('b=' line), connection data ('c=' line), and titles ('i=' line for
   each session or media).

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on June 15, 2013.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  3
   3.  Protocol Description . . . . . . . . . . . . . . . . . . . . .  3
     3.1.  Extensions to SDP  . . . . . . . . . . . . . . . . . . . .  4
       3.1.1.  Bandwidth Capability . . . . . . . . . . . . . . . . .  6
       3.1.2.  Connection Data Capability . . . . . . . . . . . . . .  8
       3.1.3.  Title Capability . . . . . . . . . . . . . . . . . . . 12
     3.2.  Session Level versus Media Level . . . . . . . . . . . . . 15
     3.3.  Offer/Answer model extensions  . . . . . . . . . . . . . . 15
       3.3.1.  Generating the Initial Offer . . . . . . . . . . . . . 15
       3.3.2.  Generating the Answer  . . . . . . . . . . . . . . . . 16
       3.3.3.  Offerer Processing of the Answer . . . . . . . . . . . 16
       3.3.4.  Modifying the Session  . . . . . . . . . . . . . . . . 16
   4.  Field Replacement Rules  . . . . . . . . . . . . . . . . . . . 16
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 17
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 17
     6.1.  New SDP Attributes . . . . . . . . . . . . . . . . . . . . 17
     6.2.  New Option Tags  . . . . . . . . . . . . . . . . . . . . . 18
     6.3.  New SDP Capability Negotiation Configuration Parameters  . 18
   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 18
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 19
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 19
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 19
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 20

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1.  Introduction

   The Session Description Protocol (SDP) [RFC4566] is intended for
   describing multimedia sessions for the purposes of session
   announcement, session invitation, and other forms of multimedia
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