that mergesthe Internet with the cellular world. It makes Internettechnologies such as the web, email, instant messaging, presence,and videoconferencing available nearly everywhere at any time.The third edition of this bestselling book is fully updated andprovides comprehensively expanded content, including new chapterson emergency calls and on Voice Call Continuity (VCC). As well asthis, The 3G IP Multimedia Subsystem (IMS) presents updatedmaterial including a comprehensive picture of Session InitiationProtocol (SIP) as well as its applicability to IMS. As most of theprotocols have been designed in the IETF, this book explains howthe IETF developed these protocols and describes how theseprotocols are used in the IMS architecture.This is an indispensable guide for engineers, programmers,business managers, marketing representatives and technically awareusers who want to understand how the IMS works and explore thebusiness model behind it.New chapters on emergency calls, Voice Call Continuity (VCC),service configuration (XCAP, XDM), and conferencingFully updated throughout, including Policy and Charging Control(PCC), QoS, Presence, Instant Messaging, Multimedia TelephonyServices, and Push-to-talk over Cellular (PoC)Describes the IP Multimedia Subsystem from two differentperspectives: from the IETF perspective, and from the 3GPPperspective.Provides details on the latest policy technology and securityarchitectureWritten by experienced professionals in the field.

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