Design, Implementation, and Performance of A Load Balancer for SIP Server Clusters

Design, Implementation, and Performance of A Load Balancer for SIP Server Clusters

Abstract:

This load balancer improves both throughput and response time versus a single node, while exposing a single interface to external clients. The algorithm achieves Transaction Least-Work-Left (TLWL), achieves its performance by integrating several features: knowledge of the SIP protocol; dynamic estimates of back-end server load; distinguishing transactions from calls; recognizing variability in call length; and exploiting differences in processing costs for different SIP transactions.

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