The ims ip multimedia concepts and services pdf
THE IMS: IP Multimedia Concepts and Services, 3rd Edition [Book]This book is written by author Miikka Poikselka. Book Description. The IMS: IP Multimedia Concepts and Services in the Mobile Domain, Second Edition, builds on the success of the previous best-selling edition, providing comprehensive coverage of IMS - its concepts, architecture, protocols and functionalities with a wealth of new and updated material. The 3 rdedition of this highly successful text builds on the achievement of the first two editions to provide comprehensive coverage of IMS. It continues to explore the concepts, architecture, protocols and functionalities of IMS while providing a wealth of new and updated information. It is written in a manner that allows readers to choose the level of knowledge and understanding they need to gain about the IMS.
IMS – the IP Multimedia System as NGN Service Delivery Platform
Several SIP extensions have been added to the basic protocol specification in order to extend its functionality. These include an efficient use of the radio interface by minimizing the exchange of signaling messages between the mobile terminal and the network, a minimum session setup time by performing tasks prior to session establishment instead of during session establishment, a minimum support required in the terminal, the support for roaming and non-roaming scenarios with terminal mobility management supported by the access network, not SIP , and support for IPv6 addressing. Other requirements involve protocol extensions, such as SIP header fields to exchange user or server information, and SIP methods to support new network functionality: requirement for registration, re-registration, de-registration, event notifications, instant messaging or call control primitives with additional capabilities such as call transference. Other specific requirements are: . There is a mechanism  in SIP for extension negotiation between user agents UA or servers, consisting of three header fields: supported , require and unsupported , which UAs or servers i. When a client initiates a SIP dialog with a server, it states the extensions it requires to be used and also other extensions that are understood supported , and the server will then send a response with a list of extensions that it requires.
The IMS builds on the success of the first two editions to provide comprehensive coverage of IMS: its concepts, architecture, protocols and functionalities. It has been completely revised to include a number of new chapters which replace superseded topics, while remaining chapters are updated. Part IV — Protocols, of the previous edition will be added to a new companion website. Places special emphasis on services, featuring more detailed descriptions of presence, messaging, group management and push-to-talk over cellular conferencing. Explores the general benefits of IMS in detail and focuses in particular on its role in fixed-mobile convergence.