Load balancing and clustering scheme for real-time VoIP applications

Abstract

Voice over IP (VoIP) is a methodology for transmitting data, video, voice, chat services, and messages over the Internet. Session Initiation Protocol (SIP) is an application layer protocol that is used to initiate, establish, modify, and terminate the session. Load balancing is the mechanism for improving the performance of a distributed and parallel system by redistribution of load between the servers. The main purpose of load balancing and clustering is to handle large number of VoIP calls on different processors. This paper presents the design, implementation, and performance evaluation of a load balancer for cluster-based SIP servers. We proposed a new measurement scheme based on OpenSIPS server to a group of machines with varying configuration and analyzed various parameters like jitter, packet loss, response time, throughput, and hence, it is possible to provide better Quality of Service (QoS) in network.