Explicit Subscriptions for the REFER Method
RFC 7614
Document | Type | RFC - Proposed Standard (August 2015; No errata) | |
---|---|---|---|
Author | Robert Sparks | ||
Last updated | 2015-10-14 | ||
Replaces | draft-sparks-sipcore-refer-explicit-subscription | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Paul Kyzivat | ||
Shepherd write-up | Show (last changed 2015-04-29) | ||
IESG | IESG state | RFC 7614 (Proposed Standard) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Ben Campbell | ||
Send notices to | (None) | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | RFC-Ed-Ack |
Internet Engineering Task Force (IETF) R. Sparks Request for Comments: 7614 Oracle Category: Standards Track August 2015 ISSN: 2070-1721 Explicit Subscriptions for the REFER Method Abstract The Session Initiation Protocol (SIP) REFER request, as defined by RFC 3515, triggers an implicit SIP-Specific Event Notification framework subscription. Conflating the start of the subscription with handling the REFER request makes negotiating SUBSCRIBE extensions impossible and complicates avoiding SIP dialog sharing. This document defines extensions to REFER that remove the implicit subscription and, if desired, replace it with an explicit one. 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/rfc7614. Copyright Notice Copyright (c) 2015 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. Sparks Standards Track [Page 1] RFC 7614 REFER Explicit Subscriptions August 2015 Table of Contents 1. Introduction ....................................................3 2. Conventions .....................................................3 3. Overview ........................................................4 3.1. Explicit Subscriptions .....................................4 3.2. No Subscriptions ...........................................5 4. The Explicit Subscription Extension .............................5 4.1. Sending a REFER ............................................5 4.2. Processing a REFER Response ................................5 4.3. Processing a Received REFER ................................6 4.4. Subscribing to the 'refer' Event ...........................7 4.5. Processing a Received SUBSCRIBE ............................7 4.6. Sending a NOTIFY ...........................................7 4.7. Managing 'refer' Event State ...............................8 4.8. The Refer-Events-At Header Field ...........................8 5. The No Subscription Extension ...................................9 5.1. Sending a REFER ............................................9 5.2. Processing a REFER Response ................................9 5.3. Processing a Received REFER ................................9 6. The 'explicitsub' and 'nosub' Option Tags ......................10 7. Updates to RFC 3515 ............................................10 8. Security Considerations ........................................10 9. IANA Considerations ............................................12 9.1. Register the 'explicitsub' Option Tag .....................12 9.2. Register the 'nosub' Option Tag ...........................12 9.3. Register the Refer-Events-At Header Field .................12 10. References ....................................................13 10.1. Normative References .....................................13 10.2. Informative References ...................................13 Author's Address ..................................................14 Sparks Standards Track [Page 2] RFC 7614 REFER Explicit Subscriptions August 2015 1. Introduction REFER, as defined by [RFC3515], triggers an implicit SIP-Specific Event Framework subscription. Sending a REFER within a dialog established by an INVITE results in dialog reuse and the associated problems described in [RFC5057]. The SIP-Specific Event Notification framework definition [RFC6665] disallows such dialog reuse. Call transfer, as defined in [RFC5589], thus requires sending a REFER request on a new dialog, associating it with an existing dialog usingShow full document text