International Journal of Engineering Sciences & Research Technology (IJESRT)
In this paper, the authors present the design, implementation and evaluation of a load balancer for cluster-based SIP servers. Their load balancer performs session-aware request assignment to ensure that SIP transactions are routed to the proper back-end node that contains the appropriate session state. They presented three novel algorithms: CJSQ, TJSQ, and TLWL. The TLWL algorithms result in the best performance, both in terms of response time and throughput, followed by TJSQ. TJSQ has the advantage that no knowledge is needed of relative overheads of different transaction types. SIP applications that require good quality of service, these dramatically lower response times are significant.