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Correct Transaction Handling for 2xx Responses to Session Initiation Protocol (SIP) INVITE Requests (RFC6026) Disclosure Number: IPCOM000200150D
Original Publication Date: 2010-Sep-01
Included in the Prior Art Database: 2010-Oct-01
Document File: 40 page(s) / 44K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Sparks: AUTHOR [+2]


This document describes an essential correction to the Session Initiation Protocol (SIP), defined in [RFC3261]. The change addresses an error in the handling of 2xx class responses to INVITE requests that leads to retransmissions of the INVITE being treated as new requests and forbids forwarding stray INVITE responses.

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Internet Engineering Task Force (IETF)                         R. Sparks Request for Comments: 6026                                       Tekelec Updates: 3261                                           T. Zourzouvillys Category: Standards Track                                          Skype ISSN: 2070-1721                                           September 2010

              Correct Transaction Handling for 2xx Responses           to Session Initiation Protocol (SIP) INVITE Requests


   This document normatively updates RFC 3261, the Session Initiation    Protocol (SIP), to address an error in the specified handling of    success (2xx class) responses to INVITE requests.  Elements following    RFC 3261 exactly will misidentify retransmissions of the request as a    new, unassociated request.  The correction involves modifying the    INVITE transaction state machines.  The correction also changes the    way responses that cannot be matched to an existing transaction are    handled to address a security risk.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Sparks & Zourzouvillys       Standards Track                    [Page 1]
 RFC 6026         Correct Handling for SIP 2xx Responses   September 2010

 Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    ( in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisions and are provided without warranty as    described in the Simplified BSD License.

Table of Contents

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

   2. Conventions and Definitions .....................................3

   3. Reason for Change ....................