"Basic Level of Interoperability for Session Initiation Protocol (SIP) Services (BLISS) Problem Statement", Jonathan Rosenberg, 24-Feb-08. ( bytes): The Session Initiation Protocol (SIP) has been designed as a general purpose protocol for establishing and managing multimedia sessions. It provides many core functions and extensions in support of features such as transferring of calls, parking calls, and so on. However, interoperability of more advanced features between different vendors has been poor. This document describes the reason behind these interoperability problems, and presents a framework for addressing them.
"An Analysis of Automatic Call Handling Implementation Issues in the Session Initiation Protocol (SIP)", John Elwell, 21-Feb-08. ( bytes): This discusses problems associated with automatic call handling (ACH) when using the Session Initiation Protocol (SIP). This work is being discussed on the bliss@ietf.org mailing list.
"Call Completion for Session Initiation Protocol(SIP)", Dale Worley, Martin Huelsemann, Denis Alexeitsev, 26-Feb-08. ( bytes): This document analyzes the interoperability problems surrounding the call-completion feature that allows a callee to put a caller's request into a queue by which the caller can be notified to call back the callee at later time. This document analyzes how different solutions inter-operate and tries to make recommendation on how to best meet this requirement.

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