In recent years, Internet Protocol (IP) telephony is becoming popular because it offers more flexibility in the implementation of new features and services. Session Initiation Protocol (SIP) is a peer-to-peer, multimedia signaling protocol standardized by the Internet Engineering Task Force (IETF) plays a vital role in providing services to IP telephony. SIP is ASCII-based, resembling HTTP, and reuses existing IP protocols such as Domain Name Service (DNS), Real Time Protocol (RTP), Session Description Protocol (SDP) etc. to provide media setup and teardown. The SIP Proxy Server (SPS) is a software application that provides call routing services for the SIP based IP telephony network. The efficiency of this process can create large scale, highly reliable packet voice networks for service providers and enterprises. We established that the efficient design and implementation of the SPS architecture can enhance the performance characteristics of a SPS significantly. In this paper, we studied the SPS performance that can be characterized by its transaction states of each SIP session of a $M/M/c$ based SIP proxy server performance model in Local and Wide Area Networks.
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机译：近年来，Internet协议（IP）电话变得越来越流行，因为它在实现新功能和新服务方面提供了更大的灵活性。会话发起协议（SIP）是由Internet工程任务组（IETF）标准化的对等多媒体信令协议，在为IP电话提供服务中起着至关重要的作用。 SIP是基于ASCII的，类似于HTTP的，并且可以重复使用现有的IP协议，例如域名服务（DNS），实时协议（RTP），会话描述协议（SDP）等，以提供媒体设置和拆除功能。 SIP代理服务器（SPS）是一个软件应用程序，可为基于SIP的IP电话网络提供呼叫路由服务。此过程的效率可以为服务提供商和企业创建大规模，高度可靠的分组语音网络。我们确定SPS体系结构的有效设计和实现可以显着增强SPS的性能特征。在本文中，我们研究了SPS性能，该性能可以通过局域网和广域网中基于$ M / M / c $的SIP代理服务器性能模型中每个SIP会话的事务状态来表征。
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