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Title: Very Bad!
Review: This book is supposed to be about VoIP. Then why is the whole last 1/3rd of the book on IPv6? It is not mentioned in the title or description, yet it is a significant part of the book. I suspect the author didn't know VoIP very well and had to pad. The VoIP parts just introduce concepts and discuss Cisco command line a little bit, but there aren't enough examples or detail to teach you anything about VoIP. It isn't even very good reference material. I wish I hadn't bought this book!
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