Dynamic Scalable Model for Video Conferencing (DSMVC) using Request Routing

The Session Initiation Protocol (SIP) is an application-layer control protocol which is used to create, alter and cease multimedia sessions. These multimedia sessions include call and video conferences, Internet telephony and other such events. In general, SIP has centralized videoconference system, which faces the drawbacks of scalability and bandwidth. When there is a need to have a multimedia conference on a large-scale, the issue of excessive load on Conference Server (CS) must be resolved. In this paper we deal with this bottleneck issue on Conference Server by examining the shortcomings of current multimedia conference model. We propose a dynamic scalable model for SIP-based conferences DSMVC (Dynamic Scalable Model for Video Conferencing), which will help us reducing the traffic from CS. In this model, clients act as a CS rather than using a one CS for every client. As a result, when the number of clients increases, the number of CS increases accordingly. Since hosts play a role of CS in this model, they need to communicate with each other and in order to do that, a client needs to know the IP address of an appropriate networking partner. DSMVC request-routing helps a client identifying the IP address of its suitable partner. We analyze the load on the network and thus assess the scalability of the conference system. By simulation of the assessment, DSMVC conference system is found to have scalability for the number of clients.