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SIP: Understanding the Session Initiation Protocol, Second Edition: Johnston, Alan B.: 9781580536554: Amazon.com: Books
Internet Communications Using SIP: Delivering VoIP and Multimedia Services with Session Initiation Protocol: Sinnreich, Henry, Johnston, Alan B.: 9780471776574: Amazon.com: Books
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Telecom 101: Sixth Edition 2022. High-Quality Reference Book Covering All Major Telecommunications Topics... in Plain English. (Telecom for Non-Engineers): Coll, Eric: 9781894887120: Amazon.com: Books
Broadband Telecommunications Handbook: Bates, Regis "Bud" J.: 9780071398510: Amazon.com: Books