Title: Save your money and wait for a better book.
Product review: I made the grave mistake of purchasing this book, thnking that I would get some decent information regarding the topic of VoIP. What I received was a summarization of the differences between IPv4 and IPv6, outdated chapters on ATM (two of them, one of which the author didn't even write!) and solitations for the author's other book covering IP Multicasting. The editing of the book was absolutely the worst that I have seen - my 7th grader can edit better than this. I'm still looking for a good reference on the topic.
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