Identification of Communications Services in the Session Initiation Protocol (SIP)
RFC 5897
Document | Type | RFC - Informational (June 2010; No errata) | |
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Author | Jonathan Rosenberg | ||
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 5897 (Informational) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Robert Sparks | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) J. Rosenberg Request for Comments: 5897 jdrosen.net Category: Informational June 2010 ISSN: 2070-1721 Identification of Communications Services in the Session Initiation Protocol (SIP) Abstract This document considers the problem of service identification in the Session Initiation Protocol (SIP). Service identification is the process of determining the user-level use case that is driving the signaling being utilized by the user agent (UA). This document discusses the uses of service identification, and outlines several architectural principles behind the process. It identifies perils when service identification is not done properly -- including fraud, interoperability failures, and stifling of innovation. It then outlines a set of recommended practices for service identification. 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/rfc5897. 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 Rosenberg Informational [Page 1] RFC 5897 Service ID in SIP June 2010 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. Services and Service Identification .............................4 3. Example Services ................................................6 3.1. IPTV vs. Multimedia ........................................6 3.2. Gaming vs. Voice Chat ......................................7 3.3. Gaming vs. Voice Chat #2 ...................................7 3.4. Configuration vs. Pager Messaging ..........................7 4. Using Service Identification ....................................8 4.1. Application Invocation in the User Agent ...................8 4.2. Application Invocation in the Network ......................9 4.3. Network Quality-of-Service Authorization ..................10 4.4. Service Authorization .....................................10 4.5. Accounting and Billing ....................................11 4.6. Negotiation of Service ....................................11 4.7. Dispatch to Devices .......................................11 5. Key Principles of Service Identification .......................12 5.1. Services Are a By-Product of Signaling ....................12 5.2. Identical Signaling Produces Identical Services ...........13 5.3. Do What I Say, Not What I Mean ............................14 5.4. Declarative Service Identifiers Are Redundant .............15 5.5. URIs Are Key for Differentiated Signaling .................15 6. Perils of Declarative Service Identification ...................16 6.1. Fraud .....................................................16 6.2. Systematic Interoperability Failures ......................17 6.3. Stifling of Service Innovation ............................18 7. Recommendations ................................................20 7.1. Use Derived Service Identification ........................20 7.2. Design for SIP's Negotiative Expressiveness ...............20 7.3. Presence ..................................................21 7.4. Intra-Domain ..............................................21 7.5. Device Dispatch ...........................................21 8. Security Considerations ........................................22 9. Acknowledgements ...............................................22 10. Informative References ........................................22Show full document text