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Reliability of Provisional Responses in Session Initiation Protocol (SIP) (RFC3262)

IP.com Disclosure Number: IPCOM000009157D
Original Publication Date: 2002-Jun-01
Included in the Prior Art Database: 2002-Aug-12
Document File: 15 page(s) / 30K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

jdrosen@dynamicsoft.com: AUTHOR [+2]

Abstract

This document specifies an extension to the Session Initiation Protocol (SIP) providing reliable provisional response messages. This extension uses the option tag 100rel and defines the Provisional Response ACKnowledgement (PRACK) method.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 9% of the total text.

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

Request for Comments: 3262� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � dynamicsoft

Category: Standards Track� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � H. Schulzrinne

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Columbia U.

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

� � � � � � � � � � � � � � � � Reliability of Provisional Responses

� � � � � � � � � � � � � � in the Session Initiation Protocol (SIP)

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 specifies an extension to the Session Initiation

� � Protocol (SIP) providing reliable provisional response messages.

� � This extension uses the option tag 100rel and defines the Provisional

� � Response ACKnowledgement (PRACK) method.

Table of Contents

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

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

� � 3� � � � UAS Behavior ........................................� � � 3

� � 4� � � � UAC Behavior ........................................� � � 6

� � 5� � � � The Offer/Answer Model and PRACK ....................� � � 9

� � 6� � � � Definition of the PRACK Method ......................� � 10

� � 7� � � � Header Field Definitions ............................� � 10

� � 7.1� � RSeq ................................................� � 10

� � 7.2� � RAck ................................................� � 11

� � 8� � � � IANA Considerations .................................� � 11

� � 8.1� � IANA Registration of the 100rel Option Tag ..........� � 11

� � 8.2� � IANA Registration of RSeq and RAck Headers ..........� � 12

� � 9� � � � Security Considerations .............................� � 12

� � 10� � � Collected BNF .......................................� � 12

� � 11� � � Acknowledgements ....................................� � 12

� � 12� � � Normative References ................................� � 13

� � 13� � � Informative References ..............................� � 13

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

RFC 3262� � � � � Reliability of Provisional Responses in SIP� � � � � June 2002

� � 14� � � Authors' Addresses ..................................� � 13

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