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 |  |  | Beyond VoIP Protocols: Understanding Voice Technology and Networking Techniques for IP Telephony by Olivier Hersent, Jean-Pierre Petit, David Gurle Hardcover, 284 Pages, Published 2005 by WileyBlackwell
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 |  |  | IP Telephony: Deploying Voice-over-IP Protocols by Olivier Hersent, JeanPierre Petit, David Gurle Hardcover, 416 Pages, Published 2005 by WileyBlackwell
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 |  |  | IP Telephony: Packet Based Multimedia Communications Systems by Olivier Hersent Paperback, 480 Pages, Published 2000 by Addison Wesley
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