Correct Transaction Handling for 2xx Responses to Session Initiation Protocol (SIP) INVITE Requests
RFC 6026
Document | Type |
RFC - Proposed Standard
(September 2010; Errata)
Updates RFC 3261
|
|
---|---|---|---|
Authors | Robert Sparks , Theo Zourzouvillys | ||
Last updated | 2020-01-21 | ||
Replaces | draft-sparks-sipcore-invfix | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized with errata bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6026 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Gonzalo Camarillo | ||
Send notices to | (None) |
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 Abstract 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. 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 (http://trustee.ietf.org/license-info) 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 ...............................................3 4. Summary of Change ...............................................4 5. Consequences if Not Implemented .................................4 6. The Change ......................................................4 7. Change Details ..................................................5 7.1. Server Transaction Impacts .................................5 7.2. Client Transaction Impacts .................................9 7.3. Proxy Considerations ......................................10 8. Exact Changes to RFC 3261 ......................................11 8.1. Page 85 ...................................................11 8.2. Page 107 ..................................................11 8.3. Page 114 ..................................................11 8.4. Pages 126 through 128 .....................................12 8.5. Pages 134 to 135 ..........................................15 8.6. Page 136 ..................................................15 8.7. Page 137 ..................................................17 8.8. Page 141 ..................................................17 8.9. Page 144 ..................................................18 8.10. Page 146 .................................................18 8.11. Page 265 .................................................18 9. IANA Considerations ............................................18 10. Security Considerations .......................................19 11. Acknowledgments ...............................................20 12. Normative References ..........................................20 Sparks & Zourzouvillys Standards Track [Page 2] RFC 6026 Correct Handling for SIP 2xx Responses September 2010 1. Introduction 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. 2. Conventions and Definitions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",Show full document text