The IESG has approved the following document: - 'An Extension to the Session Initiation Protocol (SIP) for Request History Information' (draft-ietf-sipcore-rfc4244bis-12.txt) as Proposed Standard This document is the product of the Session Initiation Protocol Core Working Group. The IESG contact persons are Richard Barnes and Gonzalo Camarillo. A URL of this Internet Draft is: http://datatracker.ietf.org/doc/draft-ietf-sipcore-rfc4244bis/ Technical Summary Like its predecessor, RFC 4244, this document defines a standard mechanism for capturing the history information associated with a Session Initiation Protocol (SIP) request. This capability enables many enhanced services by providing the information as to how and why a call arrives at a specific application or user. This document defines a new optional SIP header, History-Info, for capturing the history information in requests. This revision was made following substantial deployment experience. It clarifies many things that have been found confusing, and adds additional information that assists interpretation of the captured information. That added information helped this draft to satisfy a need to deliver the request URI and parameters to a UAS. Working Group Summary The main thing to note about the process for this document is that it was very long. It has been in progress for over three years, with three WGLCs. The first two WGLCs each identified issues that required further discussion and rework of the document. This is a reflection of a gradual realization that 4244 had glossed over many points. It also indicates that much of the significant review of the document was driven by WGLC. Document Quality There is at least one implementation. 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. There have been a number of significant reviews. The reviewers are called out in the Acknowledgements section of the document. There is nothing in this document that calls for an expert review. Personnel Paul Kyzivat is the document shepherd. Richard Barnes is the responsible area director.
