The IESG has approved the following document: - 'Mechanism to indicate support of features and capabilities in the Session Initiation Protocol (SIP)' (draft-ietf-sipcore-proxy-feature-11.txt) as Proposed Standard This document is the product of the Session Initiation Protocol Core Working Group. The IESG contact persons are Robert Sparks and Gonzalo Camarillo. A URL of this Internet Draft is: http://datatracker.ietf.org/doc/draft-ietf-sipcore-proxy-feature/ Technical Summary This specification defines a new SIP header field, Feature-Caps, to convey feature capability indicators, which are used by SIP entities not represented by the URI of the Contact header field to indicate support of features and capabilities, where media feature tags cannot be used to indicate the support. This specification also defines feature capability indicators, and creates a new IANA registry, "Proxy-Feature Feature Capability Indicator Trees", for registering feature capability indicators. Working Group Summary This document was driven by, and appears to be of interest primarily to the IMS community. However the resulting mechanism is of general applicability. Document Quality There are implementations of this document. 3GPP IMS has a dependency on this document. It will be incorporated by reference in an upcoming version of IMS, and will thus eventually be implemented widely. The document shepherd has been a reviewer and critic of this document, and promoted significant changes in the contemplated mechanism. Shida Shubert provided an in depth WGLC review. Personnel Paul Kyzivat is the document shepherd. Robert Sparks is the responsible area director.
