Updates to Asserted Identity in the Session Initiation Protocol (SIP)
RFC 5876
Document | Type |
RFC - Informational
(April 2010; No errata)
Updates RFC 3325
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|
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Author | John Elwell | ||
Last updated | 2015-10-14 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5876 (Informational) | |
Action Holders |
(None)
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||
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Cullen Jennings | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) J. Elwell Request for Comments: 5876 Siemens Enterprise Communications Updates: 3325 April 2010 Category: Informational ISSN: 2070-1721 Updates to Asserted Identity in the Session Initiation Protocol (SIP) Abstract The Session Initiation Protocol (SIP) has a mechanism for conveying the identity of the originator of a request by means of the P-Asserted-Identity and P-Preferred-Identity header fields. These header fields are specified for use in requests using a number of SIP methods, in particular the INVITE method. However, RFC 3325 does not specify the insertion of the P-Asserted-Identity header field by a trusted User Agent Client (UAC), does not specify the use of P-Asserted-Identity and P-Preferred-Identity header fields with certain SIP methods such as UPDATE, REGISTER, MESSAGE, and PUBLISH, and does not specify how to handle an unexpected number of URIs or unexpected URI schemes in these header fields. This document extends RFC 3325 to cover these situations. Status of This Memo This document is not an Internet Standards Track specification; it is published for informational purposes. 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). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see 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/rfc5876. Elwell Informational [Page 1] RFC 5876 Updates to SIP Asserted Identity April 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 ....................................................2 2. Terminology .....................................................4 3. Discussion ......................................................4 3.1. Inclusion of P-Asserted-Identity by a UAC ..................4 3.2. Inclusion of P-Asserted-Identity in Any Request ............5 3.3. Dialog Implications ........................................6 4. Behaviour .......................................................6 4.1. UAC Behaviour ..............................................7 4.2. Proxy Behaviour ............................................7 4.3. Registrar Behaviour ........................................7 4.4. UAS Behaviour ..............................................8 4.5. General Handling ...........................................8 5. Security Considerations .........................................9 6. Acknowledgements ...............................................10 7. References .....................................................10 7.1. Normative References ......................................10 7.2. Informative References ....................................11 1. Introduction The Session Initiation Protocol (SIP) is specified in RFC 3261 [RFC3261]. RFC 3325 [RFC3325] specifies a mechanism for conveying the asserted identity of the originator of a SIP request within a Trust Domain. This is achieved by means of the P-Asserted-Identity header field, which is specified for use in requests using a number of SIP methods, in particular the INVITE method. In addition, the P-Preferred-Identity header field can be used to indicate a preference for which identity should be asserted when there is a choice. Elwell Informational [Page 2] RFC 5876 Updates to SIP Asserted Identity April 2010 RFC 3325 does not specify the insertion of the P-Asserted-Identity header field by a User Agent Client (UAC) in the same Trust Domain as the first proxy. Also, RFC 3325 does not specify the use of the P-Asserted-Identity and P-Preferred-Identity header fields with certain SIP methods such as UPDATE [RFC3311], REGISTER, MESSAGEShow full document text