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Title: A good introductory reference
Review: The book borrows heavily from various published standards documents. I say "borrows", but it is more like cut and pasted. That is to say, most of the information in the book is also available in other previously published documentation fromvarious sources. Still, if you prefer not to thumb through those horrible telephony standards docs, it is handy to have this book around. It covers some stuff like AAL2 better than other recent books (mostly because this book lifts information from standards docs and uses it as is!), so it is useful in that way. Worth the money.
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