sip

Understanding SIP Servlets 1.1 (Artech House Telecommunications)
$99.00
Great book! Clear way to learn how to develop SIP Servlets, I widely recommend this book...

SIP Handbook: Services, Technologies, and Security of Session Initiation Protocol
$149.95
Widely adopted by service providers to enable IP telephony, instant messaging, and other data services, SIP is the signaling protocol of choice for advanced multimedia communications signaling. Compiled by noted engineering experts Syed Ahson and Mohammad Ilyas, SIP Handbook: Services, Technologies, and Security of Session Initiation Protocol presents a thorough technical review of all aspects of SIP. It captures the current state of IP Multimedia Subsystem technology and provides a unique source of comprehensive reference material on this subject.
SIP Applications for Today and Tomorrow

The scope of this volume ranges from basic concepts to future perspectives. Divided into three sections, the book begins with a discussion of SIP in peer-to-peer networks and then goes on to examine advanced media integration, migration considerations, mobility management, and group conferencing, while also reviewing home networking and compliance issues.

The middle section of the book focuses on the underlying technologies of SIP. Chapters review network architecture, vertical handoffs, NAT traversals, multipoint extensions, and other areas at the forefront of research. Finally, the text examines various security vulnerabilities and provides perspectives on secure intelligent SIP services with a future outlook on a fraud detection framework in VoIP networks.
Insights from International Researchers

Authored by 65 experts from across the world, this text is sure to advance the field of knowledge in this ever-changing industry and provide further impetus for new areas of exploration. Because of the editors¡Ç pivotal influence and their proximity to both the current market and the latest science, this work is certain to become the definitive text on this emerging technology.

Introduction to SIP IP Telephony Systems: Technology Basics, Services, Economics, and Installation
$14.99
This book tries to dumb-down SIP. It looks like it wants to be a training manual for a "Learning SIP" course, but doesn't provide any real technical detail. It is poorly written and a tedious read.

This is the first sentance:

"SIP is a standardized technology that allows for the sending of voice, data, and video between communication devices on public (e.g. Internet) or private (e.p. local area networks) data networks."

... and it doesn't get any better after that.

SIP Demystified by Gonazlo Camarillo is a much better read. It is engaging and well written, providing useful information for IT engineers, managers and technologists.

Session Initiation Protocol (SIP): Controlling Convergent Networks (McGraw-Hill Communication Series)
$79.95
The book is not an easy read. Let me say that right up front. In part due to the inherent complexity of SIP. And the fact that when you try to use it in tandem with other protocols and products, the complexity increases.

However if you persevere, it may be worthwhile. SIP's main usage in the marketplace seems to be as one of the enabling underlayers of VoIP. And VoIP is growing strongly, due to the allure of free long distance calls.

Not that you are necessarily restricted to VoIP. Another advantage of the book is its delineation of various other applications that also use SIP.