The paper describes a novel algorithms for a load balancer, allocates the work to the clusters of SIP server. The several load balancing algorithms for distributing Session Initiation Protocol (SIP) request to a cluster of SIP servers. This algorithm also supports the following three techniques such as CJSQ, TJSQ and TLWL. It is combine knowledge of the SIP, recognizing variability in call length, dynamic estimates of back-end server load for different SIP transactions. In this paper load balancer improves both throughput and response time.