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Review title: One of the best book
Product review: I am a freelance trainer. I use this book for my reference and reviewing the basic concept. I can not praise enough for the book, this is truely one of the best book ever written for the subject. Stalling book was also very good. I strongly recommend both for everyone.If you want a more advanced topic, you may look at Daniel Minoli's Delivering Voice over IP and Delivering Voice over Frame Relay and ATM, this is a more advanced and up-to-date, but make sure you have this and Stalling's books as your backup. I am sure you will need them to refresh the basic concept.
