Correct Transaction Handling for 2xx Responses to Session Initiation Protocol (SIP) INVITE Requests (RFC6026)
Original Publication Date: 2010-Sep-01
Included in the Prior Art Database: 2010-Oct-01
Internet Society Requests For Comment (RFCs)
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.
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 http://www.rfc-editor.org/info/rfc6026.
Zourzouvillys Standards Track [Page 1]
RFC 6026 Correct Handling for SIP 2xx Responses September 2010
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Table of Contents
1. Introduction ....................................................3
2. Conventions and Definitions .....................................3
3. Reason for Change ....................