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The Session Initiation Protocol (SIP) UPDATE Method (RFC3311)

IP.com Disclosure Number: IPCOM000010040D
Original Publication Date: 2002-Oct-01
Included in the Prior Art Database: 2002-Oct-15
Document File: 14 page(s) / 28K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Rosenberg: AUTHOR

Abstract

This specification defines the new UPDATE method for the Session Initiation Protocol (SIP). UPDATE allows a client to update parameters of a session (such as the set of media streams and their codecs) but has no impact on the state of a dialog. In that sense, it is like a re-INVITE, but unlike re-INVITE, it can be sent before the initial INVITE has been completed. This makes it very useful for updating session parameters within early dialogs.

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

Request for Comments: 3311� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � dynamicsoft

Category: Standards Track� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � September 2002

� � � � � � � � � The Session Initiation Protocol (SIP) UPDATE Method

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 specification defines the new UPDATE method for the Session

� � Initiation Protocol (SIP).� UPDATE allows a client to update

� � parameters of a session (such as the set of media streams and their

� � codecs) but has no impact on the state of a dialog.� In that sense,

� � it is like a re-INVITE, but unlike re-INVITE, it can be sent before

� � the initial INVITE has been completed.� This makes it very useful for

� � updating session parameters within early dialogs.

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

RFC 3311� � � � � � � � � � � � � � � � � � SIP UPDATE Method� � � � � � � � � � � � � September 2002

Table of Contents

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

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

� � 3� � � Overview of Operation .....................................� � � 3

� � 4� � � Determining Support for this Extension ....................� � � 3

� � 5� � � UPDATE Handling ...........................................� � � 4

� � 5.1� Sending an UPDATE .........................................� � � 4

� � 5.2� Receiving an UPDATE .......................................� � � 5

� � 5.3� Processing the UPDATE Response ............................� � � 6

� � 6� � � Proxy Behavior ............................................� � � 7

� � 7� � � Definition of the UPDATE method ...........................� � � 7

� � 8� � � Example Call Flow .........................................� � � 7

� � 9� � � Security Considerations ...................................� � 11

� � 10� � IANA Considerations .......................................� � 11

� � 11� � Notice Regarding Intellectual Property Rights .............� � 11

� � 12� � Normative References ......................................� � 11

� � 13� � Acknowledgements ..........................................� � 12

� � 14� � Author's Address ..........................................� � 12

� � 15� � Full Copyright Statement ..................................� � 13

1 Introduction

� � The Session Initiation...