基于SIP协议的语音通信技术的研究

基于SIP协议的语音通信技术的研究(课题说明书,开题报告,中期检查表,论文9000字)
摘  要 随着通信技术的日益发展，语音通信技术改变着人与人之间的交流，语音通信从电路交换到分组交换再到以软交换为核心的下一代网络（NGN）[3]。本文首先介绍软交换技术组成及功能，然后叙述了VoIP技术及其优缺点，语音通信的顺利进行离不开媒体流和信令流的相互配合，由此论述了RTP协议与RTCP协议，给出了SIP服务器与PSTN网关落地对接的方案，从几种协议中选择了一种基于SIP协议的软电话SIP语音服务器来研究，设计了一个语音通信系统。说明了一些SIP软电话常出现的一些问题并给出了相应的解决方案，最终通过搭建的SIP服务器打通了两个手机终端的SIP电话及分析了在打电话整个过程中的信令流程。
关键词 SIP；  软交换；  VoIP；  软电话

Research on Voice Communication Technology Based on SIP Protocol
Abstract  With the development of communication technology, voice communication techno
logy changes the communication between people, from circuit switching to packet switching to the next generation network (NGN) with soft switching as the core. This article first introduces the composition of soft switching technology and function, and then describes the VoIP technology and its advantages and disadvantages, voice communication smoothly without media stream and the signaling flow together, thus discusses the RTP protocol and RTCP protocol, gives the SIP server docking with the PSTN gateway floor plan, select one of several agreements a SIP soft phone based on SIP protocol to study voice server, a voice communication system is designed. Some common problems of SIP soft phone are explained and corresponding solutions are given. Finally, the SIP phone of two mobile terminals is got through through the set up SIP server and the signaling process in the whole process of making calls is analyzed.
Keywords  SIP;  Soft exchange;  VoIP;  Soft phone
 
目    录
摘要及关键词    1
1 绪论    1
2 IP语音通信技术    1
  2.1软交换技术    1
  2.2 VoIP概述及优点    2
  2.3 RTP协议与RTCP协议    2
3 SIP协议的分析    3
3.1 SIP实体    3
3.2 SIP消息    3
4 SIP服务器与PSTN网关对接方案    4
5 SIP语音服务器的搭建    6
5.1 SIP语音通信系统    6
5.2 SIP软电话简介    7
5.3 SIP软电话配置    8
5.4 SIP服务器的安装    11
5.5呼叫电话    12
5.6 SIP用户注册信令流程    12
5.7 SIP用户呼叫释放过程    14
5.8 SIP软电话的故障处理    14
6功能测试与分析    15
6.1呼叫测试    15
6.2 SIP信令流程分析    17
7结论    18
参考文献    19
致谢    21