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Cut the Cord! The Consumer's Guide to VoIP: Ledford, Jerri L.: 9781592009886: Amazon.com: Books
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VoIP: Internet Linking for Radio Amateurs: Jonathan Taylor: 9780872591431: Amazon.com: Books
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VoIP and Unified Communications: Internet Telephony and the Future Voice Network: Flanagan, William A.: 9781118019214: Amazon.com: Books
