The IESG has approved the following document: - 'Clarifications for the use of REFER with RFC6665' (draft-ietf-sipcore-refer-clarifications-04.txt) as Proposed Standard This document is the product of the Session Initiation Protocol Core Working Group. The IESG contact persons are Barry Leiba, Ben Campbell and Alissa Cooper. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-ietf-sipcore-refer-clarifications/ Technical Summary 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. Working Group Summary There was some controversy and difficulty in reaching agreement on this draft. Before work on this draft and the companion draft (draft-ietf-sipcore-refer- explicit-subscription) commenced, some (notably 3GPP) made attempts to use existing mechanisms (RFC4488) to avoid the need for GRUUs. That mechanism as insufficient on its own, and so was enhanced with particular conventions. There was a desire to maintain compatibility with that work. This led to careful word smithing. That has been discussed at length within the WG. The results are now acceptable to all parties. Document Quality The shepherd is not aware of any implementations yet. It is his understanding that 3GPP release 12 has a reference, indicating that implementations can be expected. This document has been thoroughly reviewed and discussed. Everyone that had something to say has aired it. Personnel The shepherd is Paul Kizivat. The responsible AD is Ben Campbell.
