Customer comments on this selection.
 broad and deep, but not quite up to date
I teach IMS courses for 6 years now. This is my favorite book. It's a good introduction to IMS and covers many topics in suffcient detail.
br /Still IMS is evolving fast and you have to check with the specs for the latest updates and changes.
 A well written, easy to read reference on IMS
A good and thorough intoduction to IMS and SIP. Easy to read and written in a manner that the book can be re-read over and over again. Has detailed examples on SIP Call flows with sufficient explanations. The book also acts as a bridge for some of us who are unfamiliar with mobile/cellular networks.
br /Hopefully the book will be updated with each revision of IMS.
br /Congratulations to the author.
A must have if you start with IMS
Possibly the best technical book I've ever read.
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br /I work with IMS technology and we use the book in our department to introduce IMS to newcomers. But I also work in European projects on IMS and the book is the main reference for most of the other teams involved.
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br /You just need this book and the 3GPP specifications for anything you want to do with IMS.
Very Good Book
This is a very good book on SIP-based Internet Multimedia Subsystem. The book nicely depicts both the Internet and the IMS architecture implementation of SIP, AAA, VoIP centric security and policy, QoS, presence service, media encoding and transport, and instant messaging. By reviewing this book, a reader will acquire comprehensive knowledge of emerging VoIP and Video Telephony Layer 5 architecture in wireless network. The book can be used as a senior or master-level text book, a useful review guide for the provider engineers, architects, technology strategist, product managers, and technical managers. SIP programmers, implementers, and standard engineers may find the book "not detailed enough". Since technology described in this book and their standards are rapidly changing, authors need to keep the book regularly updated.
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br /Sohel Khan, Principal Technology Strategist, Sprint-Nextel
 A mixed bag
This book intends to be the de facto handbook for IMS, but it ends up being mostly reference material.
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br /While it has some fairly detailed descriptions of the standards and protocols involved, it does not go beyond the specifications already publicly available, or the methods that some vendors already use. Some chapters read like a translation of technical drafts, while others concerning less defined areas are very high level.
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br /The authors, while doing a good job assembling useful information, probably set out to write this book too early, when IMS was still only a reference framework, without widespread service provider adoption. Furthermore, the corresponding expertise across the industry is missing, thus making this a less elaborate view on the services that IMS would provide, compared to what the book's subtitle would suggest.
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br /If you need a book on IMS right now, and are not happy with the abundance of online materials, buy this book. If you are looking for a comprehensive guide on what IMS means for providers and customers, I personally have not read such a book yet - but even if it has not been released, it is only a matter of time. Keep your eyes peeled for snippets of information coming out of service providers and infrastructure vendors, and for the ongoing debates in the industry around the evolution of the service delivery platform.
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