Date Added: Jul 2010
The advent of all-IP-based cellular networks is likely to have a profound effect on the operation and capacity of those networks as well as presenting profit making opportunities to independent application developers. 3GPP's IP Multimedia Subsystem (IMS) is at the forefront of these developments. This paper describes the forces driving the introduction of this technology in terms of the services provided and revenues expected. It is basic introductory text for anyone interested in the new IMS-based services. In the previous decades authors have seen a rapid increase in the penetration of the Internet into people's lives. This has had a profound effect on the way people communicate.