I have seen many books on VoIP, which provide the protocol aspects of VOIP/FOIP but none of them really dive into the signal processing aspects of it. This book is really written very well for the various signal processing aspects of VOIP technology.

One thing I liked very much is all the different terminologies, used in the VOIP industry, are explained so well that when the fresher or even the experienced engineer reads it he/she understands what it really means. It also provides minute details of every block of the VOIP/FOIP system with practical approach including QOS issues and testing, while the theoretical details are provided where ever needed. Third thing I like about this book is that it provides a Q&A section, which is very rare to see in these types of books. This section fills up any unanswered questions that comes in the readers mind after reading the book/section, it also serves as a quick reference.

In my opinion this book will serve as a very good practical signal processing system level reference book for everybody working (or studying) in the VOIP technology.