基于SIP网络音视频通信的研究与实现

发布时间：2018-01-19 02:31

本文关键词： 会话初始协议 PJSIP NAT穿越信令　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着互联网的快速发展和迅速普及，用户对网络通信服务的需求也日益提高。在这些网络通服务器中多媒体应用逐渐占据着主导作用，其中以物联网语音协议(Voice overInternet Protocol,VoIP)技术最为突出，VoIP是一种以IP电话为主，，在互联网上进行语音传输，并推出相应的增值业务的技术，它最大的优势在于能广泛地采用Internet和全球IP互联的环境，提供比传统业务更多、更好的服务。会话初始协议(Session Initiation Protocol,SIP)作为VoIP技术中最重要的信令协议之一，是IETF定义的应用层控制协议，用来建立、修改和终止两个或多个参与者之间的多媒体会话。SIP凭借其简单、开放、灵活、可扩展等诸多优点，已经成为多媒体通信的研究热点，并且已经被第三代合作伙伴计划(3rd Generation Partnership Project,3GPP)采纳为移动网络的应用协议，成为下一代网络技术中的关键技术之一。本文根据RFC3261对SIP协议及其相关扩展协议进行深入的研究与分析，同时对所选择的PJSIP开源项目进行了简要的介绍，并介绍了PJSIP中几种重要模块。在理解RFC和PJSIP的基础上，本文提出了改善会话建立时间以及通话稳定性的方案，并给出了可行性分析和测试结果。本文基于PJSIP协议栈实现了Windows平台下的音视频通信系统，其功能包括SIP账号注册、音视频通信、状态呈现、好友分类管理等。程序主界面显示好友列表，通过选择列表中的好友进行删除、分类管理以及进行呼叫通话的操作，还可通过搜索功能添加好友。此外，本系统还设计了SIP信令P2P的功能，能在NAT穿越的基础上，将SIP信令直接发送到对方终端上，而不经过服务器转发，可减少服务器的负担以及降低了因服务器转发报文引起的网络延迟。通过在Windows XP和Windows7操作系统下的测试表明，SIP通信系统的各项功能运行稳定，对PJSIP修改的部分也达到了预期的效果。系统还具有良好的可扩展性，后期可以在此基础上进行更多的功能实现。
[Abstract]:With the rapid development and popularity of the Internet, users' demand for network communication services is also increasing. Multimedia applications are gradually playing a leading role in these network communication servers. VoIP is one of the most prominent VoIP technologies based on VoIP, which is the Internet of things Voice Protocol (VoIP) protocol. Voice transmission over the Internet, and the introduction of corresponding value-added services technology, its biggest advantage is that it can widely use Internet and global IP interconnection environment, provide more than traditional services. Better service. Session Initiation Protocol (SIP) is one of the most important signaling protocols in VoIP technology. Sip is an application-layer control protocol defined by IETF, which is used to establish, modify and terminate multimedia sessions between two or more participants. Sip has many advantages such as simple, open, flexible, extensible and so on. Has become the research hotspot of multimedia communication, and has been the 3rd Generation Partnership Project by the 3rd generation partner plan. 3GPP) is adopted as the application protocol of mobile network and becomes one of the key technologies in the next generation network technology. According to RFC3261, this paper makes a deep research and analysis on SIP protocol and its related extension protocols, and briefly introduces the PJSIP open source project. Several important modules in PJSIP are introduced. Based on the understanding of RFC and PJSIP, this paper puts forward a scheme to improve the session establishment time and call stability. The feasibility analysis and test results are given. Based on PJSIP protocol stack, this paper implements the audio and video communication system based on Windows platform. Its functions include SIP account registration, audio and video communication, and status rendering. Friends classification management. The main interface shows the list of friends, through the selection of friends in the list to delete, classification management and call call operations, but also through the search function to add friends. In addition. The system also designed the SIP signaling P2P function, on the basis of NAT traversing, the SIP signaling can be sent directly to the other terminal without forwarding through the server. It can reduce the burden on the server and reduce the network delay caused by the server forwarding messages. The tests under Windows XP and Windows7 operating system show that the functions of Windows communication system are stable. The system also has good expansibility and can be implemented on this basis.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN916.5

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