This book is like a good tour guide.It doesn't just describe the major attractions; you share in the history, spirit, language, and culture of the place.
--Henning Schulzrinne, Professor, Columbia University
Since its birth in 1996, Session Initiation Protocol (SIP) has grown up. As a richer, much more robust technology, SIP today is fully capable of supporting the communication systems that power our twenty-first century work and life.
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