On TCP-Based SIP Server Overload Control

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Executive Summary

The Session Initiation Protocol (SIP) server overload management has attracted interest since SIP is being widely deployed in the Next Generation Networks (NGN) as a core signaling protocol. Yet all existing SIP overload control work is focused on SIP-over-UDP, despite the fact that TCP is increasingly seen as the more viable choice of SIP transport. This paper answers the following questions: Is the existing TCP flow control capable of handling the SIP overload problem. If not, why and how can they make it work. The authors provide a comprehensive explanation of the default SIP-over-TCP overload behavior through server instrumentation. They also propose and implement novel but simple overload control algorithms without any kernel or protocol level modification

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