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SIP: Understanding the Session Initiation Protocol, Second Edition: Johnston, Alan B.: 9781580536554: Amazon.com: Books
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IP Telephony Demystified (McGraw-Hill Telecom): Camp, Ken: 9780071406703: Amazon.com: Books
Amazon.com: ALGO 8036 SIP Multimedia Intercom
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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