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VoIP and Unified Communications: Internet Telephony and the Future Voice Network: Flanagan, William A.: 9781118019214: Amazon.com: Books
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VoIP 101 (Telecom for Non-Engineers): Coll, Eric: 9781894887915: Amazon.com: Books
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Softswitch : Architecture for VoIP (Professional Telecom): Ohrtman, Frank: 9780071409773: Amazon.com: Books
