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The Reason Header Field for the Session Initiation Protocol (SIP) (RFC3326)

IP.com Disclosure Number: IPCOM000010473D
Original Publication Date: 2002-Dec-01
Included in the Prior Art Database: 2002-Dec-06
Document File: 9 page(s) / 16K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

H. Schulzrinne: AUTHOR [+3]

Abstract

For creating services, it is often useful to know why a Session Initiation Protocol (SIP) request was issued. This document defines a header field, Reason, that provides this information. The Reason header field is also intended to be used to encapsulate a final status code in a provisional response. This functionality is needed to resolve the "Heterogeneous Error Response Forking Problem", or HERFP.

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Network Working Group� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � H. Schulzrinne

Request for Comments: 3326� � � � � � � � � � � � � � � � � � � � � � � � � � Columbia University

Category: Standards Track� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � D. Oran

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Cisco

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � G. Camarillo

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Ericsson

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � December 2002

� � The Reason Header Field for 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

� � For creating services, it is often useful to know why a Session

� � Initiation Protocol (SIP) request was issued.� This document defines

� � a header field, Reason, that provides this information.� The Reason

� � header field is also intended to be used to encapsulate a final

� � status code in a provisional response.� This functionality is needed

� � to resolve the "Heterogeneous Error Response Forking Problem", or

� � HERFP.

Schulzrinne, et. al.� � � � � � � Standards Track� � � � � � � � � � � � � � � � � � � � [Page 1]

RFC 3326� � � � � � � � � � � The Reason Header Field for SIP� � � � � � � December 2002

Table of Contents

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

� � 1.1. Terminology ................................................� 3

� � 2.� � The Reason Request Header Field ............................� 3

� � 3.� � Examples ...................................................� 4

� � 3.1. Call Completed Elsewhere ...................................� 4

� � 3.2. Refusing an Offer that Comes in a Response .................� 4

� � 3.3. Third Party Call Control ...................................� 5

� � 3.4. ISUP interworking ..........................................� 5

� � 4.� � IANA Considerations ........................................� 6

� � 5.� � Security Considerations ....................................� 6

� � 6.� � Acknowledgments ............................................� 7

� � 7.� � Authors' Addresses .........................................� 7

� � 8.� � Normative References .......................................� 7

� � 9...