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2008
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Explaining the Impact of Network Transport Protocols on SIP Proxy Performance

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Explaining the Impact of Network Transport Protocols on SIP Proxy Performance
This paper characterizes the impact that the use of UDP versus TCP has on the performance and scalability of the OpenSER SIP proxy server. The Session Initiation Protocol (SIP) is an application-layer signaling protocol that is widely used for establishing Voice-over-IP (VoIP) phone calls. SIP can utilize a variety of transport protocols, including UDP and TCP. Despite the advantages of TCP, such as reliable delivery and congestion control, the common practice is to use UDP. This is a result of the belief that UDP’s lower processor and network overhead results in improved performance and scalability of SIP services. This paper argues against this conventional wisdom. This paper shows that the principal reasons for OpenSER’s poor performance using TCP are caused by the server’s design, and not the low-level performance of UDP versus TCP. Specifically, OpenSER’s architecture for handling concurrent calls is responsible for most of the difference. Moreover, once these issues are...
Kaushik Kumar Ram, Ian C. Fedeli, Alan L. Cox, Sco
Added 31 May 2010
Updated 31 May 2010
Type Conference
Year 2008
Where ISPASS
Authors Kaushik Kumar Ram, Ian C. Fedeli, Alan L. Cox, Scott Rixner
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