A Case Study on Multiparty Calls Differentiation in the IP Multimedia

The IP Multimedia Subsystem (IMS) is a key component of 3G networks aimed at enabling the seamless provisioning of IP multimedia services to end users. Multiparty sessions (or conferences), which enable the conversational exchange of multimedia content between several parties, represent one of the specialized services supported by the IMS. Conferencing is the basis of a wide range of applications such as: debating; multiplayer gaming; and distance learning. In order to offer users a predictable experience and a controlled quality when using such applications, suitable QoS mechanisms must be supported in the IMS.