【作者】 李峰；

【导师】 常桂然；

【作者基本信息】 东北大学 ， 计算机应用技术， 2008， 硕士

【摘要】 SIP是由IETF提出的基于IP网络的一种实时通信应用信令协议,是下一代网络的核心协议之一,用来解决IP网络上的信令控制,其最终目标是为所有因特网成功的应用提供无所不在的接入,成为联系因特网和电信、多媒体的媒介。在新技术的研究过程中,由于各种原因,实际网络系统的实现往往是代价较高或是不现实的。在这种情况下,模拟就成了最佳可供选择的测试、评估和验证手段之一。网络模拟有着周期小、成本低等特点,而且可以使研究者更容易利用他人的研究成果,可以使研究者更专注于自己所研究的部分而不必为系统的其他部分耗费过多的精力。在此背景下,本文首先简单介绍了SIP协议并对其模拟仿真方法进行了研究,然后选择NS2作为模拟仿真平台,利用C++语言在NS2的编译层上实现了一组SIP模块并建立了编译层和解释层之间的联系。本文重点研究了SIP模拟仿真方法并在NS2平台上实现SIP分组头、UAAgent、ProxyAgen、RedirectAgent、DNSAgent、重传定时器以及SIP应用程序,并建立了它们与解释层之间的联系。设计的流程包括用户代理注册、代理服务器注册、利用代理服务器的用户代理域间通信和域内通信、用户代理利用重定向服务器进行重定向等。然后编写OTcl脚本对SIP模块进行了测试,结果证明,整个模块能够较好的完成预期的设计功能。最后,文末提出了设计的不足以及将来需要改进和研究的方向。更多还原

【Abstract】 SIP, the Session Initiation Protocol, is developed within the IETF working group, and is an instant communication application signaling protocol based on IP networks. SIP is the core protocol of NGN (Next Generation Network) and is intended to deal with the signaling control on IP network. The final goal of SIP is to provide ubiquitous Internet access and to become the media connecting Internet, multimedia and telecommunication.In the course of the studying the new technologies, it is hard to build the actual network system. So, simulation is one of the best ways to test, evaluate and verify the network system under this circumstance. The cycle of network simulation is short, and the cost of simulation is low. Other researchers can take advantage of the existing results and can pay more attention to their own studies.Under this background, the thesis analyzes a SIP system scheme systemically based on some foreign and domestic references and existing NS2 components. The scheme will make the development of a SIP system easier.The emphasis of the thesis is the design and realization of SIP packet header, UAAgent, ProxyAgent, RedirectAgent, DNSAgent, retransmission Timer and SIP Application on NS2. The processes of SIP system designed in this thesis include the registering of UA and Proxy Server, the communication between UAs using Proxy Server inside a domain and among domains, and the communication between UAs using Redirect Server. Then the system is tested with OTcl scripts.Last, further research directions are pointed out at the end.更多还原