A Framework for Session Initiation Protocol (SIP) Session Policies
RFC 6794
Document | Type | RFC - Proposed Standard (December 2012; No errata) | |
---|---|---|---|
Authors | Gonzalo Camarillo , Jonathan Rosenberg , Volker Hilt | ||
Last updated | 2015-10-14 | ||
Replaces | draft-ietf-sipping-session-policy-framework | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | WG Document | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 6794 (Proposed Standard) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Robert Sparks | ||
IESG note | IPR disclosure on this from RIM - https://datatracker.ietf.org/ipr/1227/ | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) V. Hilt Request for Comments: 6794 Bell Labs/Alcatel-Lucent Category: Standards Track G. Camarillo ISSN: 2070-1721 Ericsson J. Rosenberg jdrosen.net December 2012 A Framework for Session Initiation Protocol (SIP) Session Policies Abstract Proxy servers play a central role as an intermediary in the Session Initiation Protocol (SIP) as they define and impact policies on call routing, rendezvous, and other call features. This document specifies a framework for SIP session policies that provides a standard mechanism by which a proxy can define or influence policies on sessions, such as the codecs or media types to be used. It defines a model, an overall architecture and new protocol mechanisms for session policies. 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/rfc6794. Copyright Notice Copyright (c) 2012 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 Hilt, et al. Standards Track [Page 1] RFC 6794 Session Policy Framework December 2012 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. Terminology .....................................................5 3. Session-Independent Policies ....................................5 3.1. Architecture and Overview ..................................5 3.2. Policy Subscription ........................................6 3.2.1. User Agent Client (UAC) Behavior ....................6 3.2.2. User Agent Server (UAS) Behavior ....................8 4. Session-Specific Policies .......................................8 4.1. Architecture ...............................................8 4.2. Overview ...................................................9 4.3. Examples ..................................................11 4.3.1. Offer in Request ...................................11 4.3.2. Offer in Response ..................................13 4.4. UA/Policy Server Rendezvous ...............................15 4.4.1. UAC Behavior .......................................15 4.4.2. Proxy Behavior .....................................17 4.4.3. UAS Behavior .......................................20 4.4.4. Caching the Local Policy Server URI ................21 4.4.5. Header Field Definition and Syntax .................22 4.5. Policy Channel ............................................23 4.5.1. Creation and Management ............................24 4.5.2. Contacting the Policy Server .......................25 4.5.3. Using Session Policies .............................26 5. Security Considerations ........................................27 6. IANA Considerations ............................................29 6.1. Registration of the "Policy-ID" Header Field ..............29 6.2. Registration of the "Policy-Contact" Header Field .........29 6.3. Registration of the "non-cacheable" Policy-Contact Header Field Parameter ....................................29 6.4. Registration of the "policy" SIP Option Tag ...............29 7. References .....................................................30 7.1. Normative References ......................................30 7.2. Informative References ....................................31 Appendix A. Acknowledgements ......................................32Show full document text