IMPROVING TRAFFIC PERFORMANCE ON IMS NETWORK

The IP Multimedia Subsystem (IMS) enables the convergence of voice, data, and multimedia services such as Voice over IP (VoIP), Video over IP, push-to-talk, presence or instant messaging services and so. IMS is well integrated with existing voice and data networks, while adopting many of their key characteristics.SIP (Session Initiation Protocol) provides a pathway to build a single unified network, bridging the gap that previously existed between the once-separated Telecom and Internet networks.The Call Session Control Functions (CSCFs) servers are the key part of the IMS structure. They are the main components responsible for processing and routing signalling messages.Presence is a service that allows a user to be informed about the reachability, availability, and willingness to communicate of another user. A study shows that presence service can account for 50% or more of the total signalling traffic the IMS core network [1]because of NOTIFY messages flow. So, we try to optimizing their mechanism by giving proposal of reducing SIP latency and waiting time for service in a multi-server environment.Solutions proposed will ovoid SIP server overload and therefore degradation of QoS (Quality of Service).