Beginning with a short summary of the core protocols and addressing of the Internet and the World Wide Web, this introduction to SIP explains how eventually it will unleash sessions that bear almost no resemblance to a telephone call.

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Alan B. Johnston is an advisory engineer at WorldCom and an adjunct at Washington University. He holds a B.E.(Hons) in electrical and electronic engineering from the University of Melbourne, Australia and a Ph.D. in electrical engineering from Lehigh University.

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