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Title: Internet Communications using SIP: Delivering VoIP and Multimedia Services with Session Initiation Protocol / Edition 2, Author: Henry Sinnreich Read an excerpt of this book!
Title: Sip beyond Voip: The Next Step in the IP Communications Revolution, Author: Henry Sinnreich
Title: Internet Communications Using SIP: Delivering VoIP and Multimedia Services with Session Initiation Protocol / Edition 1, Author: Henry Sinnreich