--- 1/draft-ietf-sipcore-refer-clarifications-02.txt 2015-03-03 09:14:40.102955333 -0800 +++ 2/draft-ietf-sipcore-refer-clarifications-03.txt 2015-03-03 09:14:40.118955719 -0800 @@ -1,19 +1,19 @@ Network Working Group R. Sparks Internet-Draft Oracle Updates: 3515 (if approved) A. Roach Intended status: Standards Track Mozilla -Expires: August 3, 2015 January 30, 2015 +Expires: September 4, 2015 March 3, 2015 Clarifications for the use of REFER with RFC6665 - draft-ietf-sipcore-refer-clarifications-02 + draft-ietf-sipcore-refer-clarifications-03 Abstract The SIP REFER method relies on the SIP-Specific Event Notification Framework. That framework was revised by RFC6665. This document highlights the implications of the requirement changes in RFC6665, and updates the definition of the REFER method, RFC3515, to clarify and disambiguate the impact of those changes. Status of This Memo @@ -24,21 +24,21 @@ Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." - This Internet-Draft will expire on August 3, 2015. + This Internet-Draft will expire on September 4, 2015. 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 @@ -141,23 +141,24 @@ A user agent wishing to identify an existing dialog (such as for call transfer as defined in [RFC5589]) MUST use the "Target-Dialog" extension defined in [RFC4538] to do so, and user agents accepting REFER MUST be able to process that extension in requests they receive. If a user agent can be certain that no implicit subscription will be created as a result of sending a REFER request (such as by requiring an extension that disallows any such subscription [I-D.ietf-sipcore-refer-explicit-subscription]), the REFER request - MAY be sent within an existing dialog. Such a REFER will be - constructed with its Contact header field populated with the dialog's - Local URI as specified in section 12 of [RFC3261]. + MAY be sent within an existing dialog (whether or not the remote + target is a GRUU). Such a REFER will be constructed with its Contact + header field populated with the dialog's Local URI as specified in + section 12 of [RFC3261]. As described in section 4.5.2 of [RFC6665], there are cases where a user agent may fall back to sharing existing dialogs for backwards- compatibility purposes. This applies to REFER only when the peer has not provided a GRUU as its Contact in the existing dialog (i.e. when the peer is a pre-RFC6665 implementation). 5. Security Considerations This document introduces no new security considerations directly. @@ -172,27 +173,32 @@ Christer Holmberg provided the formulation for the final paragraph of the introduction. Christer Holmberg and Ivo Sedlacek provided detailed comments during working group discussion of the document. 8. Changelog RFC Editor - please remove this section when formatting this document as an RFC - -02 to -01 + -02 to -03 + + Reinforced that the MAY send in-dialog applied no matter what + the remote target URI contained. + -01 to -02 Tweaked the third paragraph of section 3 per list discussion. (Note the subject line of that discussion said -explicit- subscription) -00 to -01 + Added the 3rd paragraph to the introduction per extensive list discussion draft-sparks-sipcore-refer-clarifications-05 to draft-ietf- sipcore-refer-clarifications-00 Attempted to improve the accuracy of the Abstract and Introduction without diluting the essential point of the document.