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The transport protocol for SIP can be chosen based on the requirements of services and network conditions. How does the choice of TCP affect the scalability and performance compared to UDP? The authors experimentally analyze the impact of using TCP as a transport protocol for a SIP server. This paper first investigates scalability of a TCP echo server, then compare performance of a SIP server for three TCP connection lifetimes: transaction, dialog, and persistent. The results show that a Linux machine can establish 450,000+ TCP connections and maintaining connections does not affect the transaction response time.
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