(IP Multimedia Subsystem (IMS
IMS is the cornerstone of the future IP based cellular networks. It was designed to support the most advanced data services from day one. IMS offers built-in mechanisms for IP-based charging (postpaid and prepaid) as well as quality of service and high level of security.
The IMS framework supports: Network level, personal and group communications; Rich multimedia and IP based applications; End-to-end QoS through control plane and media plane
By combining existing voice, video, data and messaging services over a single IP network, IMS will bring the full potential of Internet technology to mobile users while allowing the creation of a new business cycle for wireless operators.