【作者】 王欣；

【导师】 刘辰；

【作者基本信息】 北京邮电大学 ， 计算机科学与技术， 2010， 硕士

【摘要】 IP电话(VoIP, Voice over IP)在互联网的高速发展下,以其费用低,占用带宽低等优势,正在逐渐取代传统的PSTN,成为下一代网络中语音信息传输的主要形式。作为建立VoIP会话的信令协议SIP,正在凭借它简单、易扩展、易实现等特性越来越受到业界的青睐,成为了互联网和电信网领域中十分重要的协议。同时P2P技术也因为其高扩展性、高容错性以及健壮性等特点,成为目前互联网应用中的主流技术。在VoIP领域,如何使SIP协议和P2P技术两者有效互补,提供高效、优质的VoIP服务,正在成为研究热点。目前很多机构、组织、公司都在这方面进行着研究和尝试,但是始终存在各种各样的问题。本文在现有研究的基础上,提出并设计了一种高效、易于实现的P2P-SIP系统,并进行了深入研究和探讨。首先,本文分别介绍了SIP协议以及P2P技术的相关特性以及优缺点,通过分析现有的SIP和P2P相结合的一些研究成果,在高效、易扩展、易实现的设计目标上,设计了一种采用了SIP using P2P模式、使用Chord算法构建双重网络结构以及SIP用户端和P2P节点高度松耦合形式的P2P-SIP语音电话系统,并对整个系统进行了详细的阐述。最后,论文对该系统的原型系统进行了系统测试,对本系统的测试结果进行分析,并作出最后的总结。更多还原

【Abstract】 With the rapid development of the Internet, VoIP is taking the place of traditional PSTN gradually because of its advantages of low cost and low bandwidth. It has become the major form of NGN to transmit voice. According to the VoIP signaling protocol-SIP (Session Initiation Protocol), is getting more and more popular in this field owing to the characteristics of its simplicity, easy extension and easy realization, which has made it become a very important protocol in the world of the Internet and the telecommunications. Meanwhile, the technology of P2P has also become the mainstream technology in the application of the Internet because of its features of extendability, fault-tolerance capability and robustnessHow to make the SIP and the P2P Technology to complement each other effectively and to provide efficient and high quality VoIP Service in the VoIP field is becoming the researching hot spot. Nowadays, there are many institutions, organizations and companies that are doing some researches. However, there still exist various problems. This paper has proposed and designed an efficient and easily realized P2P-SIP system based on the existing researches. Further research and exploration of the system have been discussed in this paper.Firstly, the related characteristics and its merits and demerits of SIP and P2P technology are introduced. Secondly, the P2P-SIP VoIP system, which adopted SIP using P2P model, using Chord Algorithm to construct double overlay network and loose coupling architecture after analyzing the existing researches which were combined SIP with P2P, is illustrated in detail,Finally, the author conducted a system test to check up the system’s prototype system, analyzed the testing result of the system, and made a conclusion.更多还原