VoIP and Unified Communications by William A. Flanagan - 9781118019214

Beyond VoIP Protocols: Understanding Voice Technology and... - Olivier Hersent

Voip and Unified Communications: Internet Telephony and the Future Voice Network

Headache in the Pelvis : A New Understanding by David Wise and Rodney Anderson

Beyond VoIP Protocols: Understanding Voice Technology and Networ

Terrorism : Understanding the Global Threat Hardcover David Whitt

Voice over Internet Protocol (VoIP) Security

VoIP : Wireless, P2P and New Enterprise Voice over IP Hardcover