The convergence of telecom and Internet are yet to be matured enough to effectively solve the major challenges, like quality of service, different kinds of charging, and security. IP Multimedia Subsystems (IMS) techniques are one of the strong contenders to solve the above problems by proposing overlay network architecture. It is imperative to find out an optimum network design to support rapidly increasing users efficiently, for signaling and services. Our present work addresses the issues involved in predicting the performance (end-to-end node delay) for signaling in the IMS network. We have implemented IMSsignaling prototype test bed and also did the simulation of the same model. Moreover, we have introduced in this case a rule engine to dynamically alter the call flow direction through different network nodes, to effectively study the performance of the various nodes. Our observed results from the implementation and simulation are close. Furthermore, we found out that amongst the nodes involved in call processing, the maximum delay takes place at Serving-Call Session Control Function (S-CSCF).

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3G networks offer new opportunities for mobile or nomadic users to remain connected to their services through changes in environment conditions. Such continuity still presents challenges however. 3G networks require resource management to guarantee that services will meet performance expectations. Also, because of cost, alternate wireless networking technologies can now be used in complement with 3G to take advantage of hotspots, while still preserving continuity of session.In this paper, we propose and analyse a multi-network session management infrastructure based on established protocols. The session unifies information on active services over different access networks. It supports service continuity, migration of services between networks to attempt to always give to the user a better experience at lower cost.A session supports composition of services based on different signalling models, although our primary focus is on SIP and HTTP, and our concept derived from IMS.