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引用次数: 24
摘要
会话发起协议(SIP)是一种处理两点间会话的应用层协议，广泛应用于互联网电话。SIP协议是在用户数据报协议(UDP)或传输控制协议(TCP)之上实现的。SIP消息通过UDP或TCP传输。本文研究了基于UDP和TCP协议的SIP信令网络的性能。网络模拟器(ns-2)用于评估吞吐量和呼叫设置延迟作为性能度量。我们已经在ns-2中实现了作为SIP元素的新代理，并且发现存在显著的性能差异。在SIP over UDP的情况下，SIP消息的重传会降低吞吐量。另一方面，在SIP over TCP的情况下，TCP的窗口控制增大了呼叫建立延迟。
Performance comparisons of transport protocols for session initiation protocol signaling
Session initiation protocol (SIP), which is widely used for Internet telephony, is an application-layer protocol to handle sessions between two points. SIP is implemented on the top of user datagram protocol (UDP) or transmission control protocol (TCP). SIP messages are transmitted by UDP or TCP. This study is on the performance of SIP signaling network using UDP and TCP. A network simulator (ns-2) is used to evaluate throughput and call setup delay as performance measures. We have implemented new agents that act as SIP elements in the ns-2 and a significant performance difference was found to exist. In the case of SIP over UDP, retransmissions of SIP messages decrease throughput. On the other hand, in the case of SIP over TCP, the window control of TCP enlarges a call setup delay.
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