In recent years, transmission of packets over internet has been a real alternative to the traditional Public Switched Telephone Networks (PSTN). The Internet Protocol (IP) offers more flexibility in the design and implementation of features and services. The Session Initiation Protocol (SIP) is a commonly adopted signaling protocol for Voice over IP (VoIP) by many telecommunication industries. Since the signaling system of PSTN, Signaling System Number 7 (SS7) was designed for high reliability, but IP works on the "Best Effort" basis which motivated us to study the performance characteristics of SIP control plane. In this paper, we studied an M/M/1 performance model of the SIP Proxy Server, showed its limitations, and designed an alternative M/D/1 performance model that enhances the SIP Proxy Server performance.
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机译：近年来，通过Internet传输数据包已成为传统公共交换电话网（PSTN）的真正替代。 Internet协议（IP）在功能和服务的设计和实现方面提供了更大的灵活性。会话发起协议（SIP）是许多电信行业普遍采用的IP语音（VoIP）信令协议。自从PSTN的信令系统以来，7号信令系统（SS7）的设计就具有很高的可靠性，但是IP在“尽力而为”的基础上工作，这促使我们研究SIP控制平面的性能特征。在本文中，我们研究了SIP代理服务器的M / M / 1性能模型，显示了其局限性，并设计了可增强SIP代理服务器性能的替代M / D / 1性能模型。
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