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Your Hands-On Guide to Voice over IP (VoIP)This book was written for the thousands of IT professionals-from CIOs to circ
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This book begins with an introduction to PBXs (Private Branch Exchanges) and the scene, statistics and involved actors.
142 41 3MB Read more
Showing you how online criminals perform reconnaissance, gain access, steal data, and penetrate vulnerable systems, this
363 33 16MB Read more
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Put your phone system on your computer network and see the savingsSee how to get started with VoIP, how it works, and wh
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This book sorts through the overwhelming mass of open source security tools, chooses a few of the best, and shows networ
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* The VPN Router Portfolio is a new product based on Nortel's VPN and security gateway products that is constructed
713 39 26MB Read more
Security is now the number one concern for businesses world wide. The gold standard for attaining security is cryptograp
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382 17 22MB Read more
Voice over Internet Protocol (VoIP) is gaining a lot of attention these days, as more companies and individuals switch f
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