【作者】 易培彬；

【导师】 马严；

【作者基本信息】 北京邮电大学 ， 软件工程， 2008， 硕士

【摘要】 随着多媒体通信技术和网络技术的飞速发展,Internet带动了以IP为基础的各种应用的迅猛发展。IP电话的出现,使宽带网上实现多媒体通信已经成为可能。以IP为基础的各种应用的迅猛发展也对IP电话技术中非常重要的信令控制技术提出了新的要求。现有的IP电话信令控制协议H.323协议由于自身的限制无法很好的满足这种新要求,而SIP协议以其所具有的结构简洁、易于扩展和适于Internet接入等良好的特性,使得基于SIP协议的IP电话实现了大规模应用。本文首先介绍了IP电话的相关协议,SIP协议中IP电话的工作原理和相关流程,着重对SIP协议的体系结构以及开源协议栈oSIP进行了详细的分析,论文在对VoIP技术研究的基础上,提出了基于SIP的VoIP终端的应用方案,设计实现了基于SIP的IP电话客户端。接下来在PC机上进行了客户端的功能测试。结果证明,该客户端能够较好得完成预期的设计功能。最后论文指出了本文研究中的不足之处和进一步研究方向。更多还原

【Abstract】 With the rapid development of multimedia communication technology and network technology, Internet has led to IP-based applications of rapid development. With the emergence of IP phone, broadband Internet multimedia communication has become possible.With rapid development of IP phone technology, it has made new demands for signal control technology. Compared with signal control protocol H.323, the SIP protocol has more advantages such as simple and flexible, easy to internet access and suitable for extendibility. So nowadays IP phones have access to a large-scale development and application.This thesis first introduced the related protocols of IP phone, working principle and related processes of IP phone based on SIP protocol, then has a detailed analysis focusing on the architecture of SIP and open source protocol stack oSIP . Based on the research of VOIP technology this thesis brings forward the Project of VoIP terminal for SIP, design and implement the IP Phone client based on SIP., tested and analyzed the system after designing IP phone client. The result shows the SIP phone client runs stably and achieves the requirements of communication in the design. Finally, this paper sums up the main points research and raises the future work.更多还原