Miscellaneous Capabilities Negotiation in the Session Description Protocol (SDP)
draft-ietf-mmusic-sdp-miscellaneous-caps-06

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MMUSIC WG                                               M. Garcia-Martin
Internet-Draft                                                  Ericsson
Intended status: Standards Track                         S. Veikkolainen
Expires: December 07, 2013                                         Nokia
                                                               R. Gilman

                                                           June 05, 2013

   Miscellaneous Capabilities Negotiation in the Session Description
                             Protocol (SDP)
              draft-ietf-mmusic-sdp-miscellaneous-caps-06

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

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on December 07, 2013.

Copyright Notice

Garcia-Martin, et al.   Expires December 07, 2013               [Page 1]
Internet-Draft     SDP Misc. Capabilities Negotiation          June 2013

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
   3.  Protocol Description  . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Extensions to SDP . . . . . . . . . . . . . . . . . . . .   3
       3.1.1.  Bandwidth Capability  . . . . . . . . . . . . . . . .   5
       3.1.2.  Connection Data Capability  . . . . . . . . . . . . .   7
       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 . . . . . . . . . . . . . . . . . . .  17
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
     6.1.  New SDP Attributes  . . . . . . . . . . . . . . . . . . .  18
     6.2.  New Option Tags . . . . . . . . . . . . . . . . . . . . .  19
     6.3.  New SDP Capability Negotiation  Configuration Parameters   19
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  19
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  19
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

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
   session initiation.  SDP has been extended with a SDP Capability
   Negotiation Mechanism Framework [RFC5939] which allows the endpoints
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