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A Transport Independent Bandwidth Modifier for the Session Description Protocol (SDP) (RFC3890)

IP.com Disclosure Number: IPCOM000031198D
Original Publication Date: 2004-Sep-01
Included in the Prior Art Database: 2004-Sep-17
Document File: 23 page(s) / 50K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Westerlund: AUTHOR

Abstract

This document defines a Session Description Protocol (SDP) Transport Independent Application Specific Maximum (TIAS) bandwidth modifier that does not include transport overhead; instead an additional packet rate attribute is defined. The transport independent bit-rate value together with the maximum packet rate can then be used to calculate the real bit-rate over the transport actually used.

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Network Working Group                                      M. Westerlund

Request for Comments: 3890                                      Ericsson

Category: Standards Track                                 September 2004

              A Transport Independent Bandwidth Modifier

               for the Session Description Protocol (SDP)

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 Internet Society (2004).

Abstract

   This document defines a Session Description Protocol (SDP) Transport

   Independent Application Specific Maximum (TIAS) bandwidth modifier

   that does not include transport overhead; instead an additional

   packet rate attribute is defined.  The transport independent bit-rate

   value together with the maximum packet rate can then be used to

   calculate the real bit-rate over the transport actually used.

   The existing SDP bandwidth modifiers and their values include the

   bandwidth needed for the transport and IP layers.  When using SDP

   with protocols like the Session Announcement Protocol (SAP), the

   Session Initiation Protocol (SIP), and the Real-Time Streaming

   Protocol (RTSP), and when the involved hosts has different transport

   overhead, for example due to different IP versions, the

   interpretation of what lower layer bandwidths are included is not

   clear.

Westerlund                  Standards Track                     [Page 1]

RFC 3890               Bandwidth Modifier for SDP         September 2004

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3

       1.1.  The Bandwidth Attribute. . . . . . . . . . . . . . . . .  3

             1.1.1.  Conference Total . . . . . . . . . . . . . . . .  3

             1.1.2.  Application Specific Maximum . . . . . . . . . .  3

             1.1.3.  RTCP Report Bandwidth. . . . . . . . . . . . . .  4

       1.2.  IPv6 and IPv4. . . . . . . . . . . . . . . . . . . . . .  4

       1.3.  Further Mechanisms that Change the Bandwidth

             Utilization. . . . . . . . . . . . . . . . . . . . . . .  5

             1.3.1.  IPsec. . . . . . . . . . . . . . . . . . . . . .  5

             1.3.2.  Header Compression . . . . . . . . . . . . . . .  5

   2.  Definitions. . . . . . . . . . . . . . . . . . . . . . . . . .  6

       2.1. ...