The Session Description Protocol (SDP) 'trafficclass' Attribute
draft-ietf-mmusic-traffic-class-for-sdp-01

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Last updated 2012-04-03 (latest revision 2012-03-12)
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Network WG                                                   James Polk
Internet-Draft                                           Subha Dhesikan
Expires: Sept 12, 2012                                       Paul Jones
Intended Status: Standards Track (PS)                     Cisco Systems
                                                         March 12, 2012

    The Session Description Protocol (SDP) 'trafficclass' Attribute
               draft-ietf-mmusic-traffic-class-for-sdp-01

Abstract

   This document proposes a new Session Description Protocol (SDP) 
   attribute to identify the traffic class a session is requesting
   in its offer/answer exchange.  

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 September 12, 2012.

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Traffic Class Framework and String Definitions  . . . . . . .  5
   3.  Traffic Class Attribute Definition  . . . . . . . . . . . . . 11
   4.  Offer/Answer Behavior . . . . . . . . . . . . . . . . . . . . 15
       4.1 Offer Behavior  . . . . . . . . . . . . . . . . . . . . . 15
       4.2 Answer Behavior . . . . . . . . . . . . . . . . . . . . . 15
   5.  Security considerations . . . . . . . . . . . . . . . . . . . 16
   6.  IANA considerations . . . . . . . . . . . . . . . . . . . . . 17
   7.  Acknowledgments   . . . . . . . . . . . . . . . . . . . . . . 19
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . 19
       8.1.  Normative References  . . . . . . . . . . . . . . . . . 19
       8.2.  Informative References  . . . . . . . . . . . . . . . . 20
       Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . 20
       Appendix  . . . . . . . . . . . . . . . . . . . . . . . . . . 20

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

1.  Introduction

   The Session Description Protocol (SDP) [RFC4566] provides a means 
   for an offerer to describe the specifics of a session to an 
   answerer, and for the answerer to respond back with its session 
   specifics to the offerer.  These session specifics include offering 
   the codec or codecs to choose from, the specific IP address and port
   number the offerer wants to receive the RTP stream(s) on/at, the 
   particulars about the codecs the offerer wants considered or 
   mandated, and so on.  

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   There are many facets within SDP to determine the Real-time 
   Transport Protocol (RTP) [RFC3550] details for the session 
   establishment between one or more endpoints, but identifying how the
   underlying network should process each stream still remains 
   under-specified. 

   The ability to identify a traffic flow by port number gives an 
   indication to underlying network elements to treat traffic with 
   dissimilar ports in a different way, the same or in groups the same 
   - but different from other ports or groups of ports.

   Within the context of realtime communications, the labeling of an 
   RTP session based on media descriptor lines as just a voice and/or 
   video session is insufficient, and provides no guidelines to the 
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