This book is a must have for anyone wanting solid information on IMS. This is some of the best IMS reference materials with only around 300 pages. You can't beat the value this book offers.



The authors do an incredible job in explaining IMS to readers. I enjoyed the layout of this book for the "modular design" it contained within its sessions. The first session of this book is dedicated to high-level architecture and the foundations of IMS. It is easy to understand the values of IMS such as session control, service blending, QoS, flexible charging and the evolution with key elements in control, bearer, and application planes. Once you have a good grasp from session 1, session 2 further breaks down various essences of IMS into components. This is very helpful in getting the background information such as SIP, SDP, MSRP, XML, and Diameter for building IMS serving certain types of purposes.



Session 3 are dedicated to the `enablers' of IMS OMA. These chapters include information on these OMA enablers' design purposes, features, values provided to subscribers and how to implement them. The book is written in an easy to follow layout.



Session 4 is most interesting session by reading various vignettes to get into the contexts of IMS in real world implementations. The IMS service delivery framework are laid out for high-level viewing on what and how IMS new services are designed, introduced and maintained. The authors did a marvelous job on these real-world scenarios to help readers fully understand how IMS relates to everyone's life.



I believe that anyone reading this book will benefit from the information presented, no matter how the depth the readers expect on IMS real world implementations. The book helps in these areas and more. The real bonus of this book is written by three experts from AT&T. It's by far the best IMS book I have ever read. Grab it and read a few pages, you will find how indispensable this book is.

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