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An Offer/Answer Model with Session Description Protocol (SDP) (RFC3264)

IP.com Disclosure Number: IPCOM000009209D
Original Publication Date: 2002-Jun-01
Included in the Prior Art Database: 2002-Aug-13
Document File: 26 page(s) / 61K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Rosenberg: AUTHOR [+2]

Abstract

This document defines a mechanism by which two entities can make use of the Session Description Protocol (SDP) to arrive at a common view of a multimedia session between them. In the model, one participant offers the other a description of the desired session from their perspective, and the other participant answers with the desired session from their perspective. This offer/answer model is most useful in unicast sessions where information from both participants is needed for the complete view of the session. The offer/answer model is used by protocols like the Session Initiation Protocol (SIP).

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Network Working Group� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � J. Rosenberg

Request for Comments: 3264� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � dynamicsoft

Obsoletes: 2543� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � H. Schulzrinne

Category: Standards Track� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Columbia U.

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � June 2002

� � An Offer/Answer Model with 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 (2002).� All Rights Reserved.

Abstract

� � This document defines a mechanism by which two entities can make use

� � of the Session Description Protocol (SDP) to arrive at a common view

� � of a multimedia session between them.� In the model, one participant

� � offers the other a description of the desired session from their

� � perspective, and the other participant answers with the desired

� � session from their perspective.� This offer/answer model is most

� � useful in unicast sessions where information from both participants

� � is needed for the complete view of the session.� The offer/answer

� � model is used by protocols like the Session Initiation Protocol

� � (SIP).

Table of Contents

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

� � 2� � � � � � � � � Terminology .........................................� � � 3

� � 3� � � � � � � � � Definitions .........................................� � � 3

� � 4� � � � � � � � � Protocol Operation ..................................� � � 4

� � 5� � � � � � � � � Generating the Initial Offer ........................� � � 5

� � 5.1� � � � � � � Unicast Streams .....................................� � � 5

� � 5.2� � � � � � � Multicast Streams ...................................� � � 8

� � 6� � � � � � � � � Generating the Answer ...............................� � � 9

� � 6.1� � � � � � � Unicast Streams .....................................� � � 9

� � 6.2� � � � � � � Multicast Streams ...................................� � 12

� � 7� � � � � � � � � Offerer Processing of the Answer ....................� � 12

� � 8� � � � � � � � � Modifying the Session ...............................� � 13

Rosenberg & Schulzrinne� � � � Standards Track� � � � � � � � � � � � � � � � � � � � [Page 1]

RFC 3264� An Offer/Answer Model Session Description Protocol� � June 2002

� � 8.1� � � � � � � Adding a Media Stream ............