基于SIP协议的跨平台即时通信系统研究

发布时间：2019-01-05 15:03

【摘要】：随着互联网的蓬勃发展,即时通信(IM)业务的应用越来越广泛,并逐渐成为了人们生活中不可或缺的网络业务。而目前主流的即时通信系统都采用各自私有的IM协议,导致各个即时通信软件之间不能相互通信,而且,目前主流的即时通信软件大多都集中在windows平台下,很少考虑Linux用户的需求。本论文设计了一种基于SIP协议的跨平台即时通信系统方案,旨在以开放的标准SIP及其扩展协议作为基础,来解决即时通信软件之间因私有协议而不能进行信息交流的问题。SIP协议是一个发展成熟的、兼容性较强的应用层控制协议,它可以用于音频/视频会话的建立、修改和释放等,同时还能实现即时消息的发送/接收,而且SIP及其扩展协议具有良好的扩展性,使得SIP协议逐渐成为了NGN和IMS中最重要的网络协议之一,这也是本论文选择SIP协议作为即时通信系统基础协议的重要原因之一。Qt是一个跨平台的C++应用程序和UI开发框架,它的开发宗旨是:一次开发,随处编译,即应用开发人员只需一次性开发应用程序,便可以在不同操作系统下运行该程序,实现真正意义上的跨平台开发。在本论文中,采用Qt作为开发框架实现同一即时通信软件在不同操作系统下的信息交互。本论文从SIP及其扩展协议着手,分析了即时通信系统的技术要求,研究并设计了即时通信系统客户端的总体框架。从功能模块上划分,将即时通信系统分为用户注册管理功能模块、联系人列表管理功能模块、IM即时消息管理功能模块、Presence呈现业务管理功能模块和群组管理模块等,其中,联系人列表模块、IM模块和Presence模块是即时通信系统的基础业务,也是本论文的重点。联系人列表主要完成联系人信息的维护和联系人的添加、删除等操作;IM模块负责即时消息的发送/接收;Presence模块业务主要完成呈现消息的发布以及订阅/通知。最后,对即时通信系统进行了功能测试,测试结果表明,本论文中的即时通信软件实现了好友列表管理、好友间多媒体信息交互等即时通信功能,而且,系统较为稳定,界面简洁友好,可以作为产品化设计的参考。
[Abstract]:With the rapid development of the Internet, the application of instant messaging (IM) service is becoming more and more extensive, and has gradually become an indispensable network service in people's lives. At present, the mainstream instant communication systems adopt their own private IM protocol, which leads to the inability to communicate with each other among the instant messaging software. Moreover, most of the current mainstream instant messaging software are concentrated under the windows platform. Little consideration is given to the needs of Linux users. In this paper, a cross-platform instant messaging system based on SIP protocol is designed, which is based on the open standard SIP and its extended protocol. SIP protocol is a mature and compatible application layer control protocol, which can be used to establish audio / video session. At the same time, the SIP and its extension protocol have good extensibility, which makes SIP protocol become one of the most important network protocols in NGN and IMS. Qt is a cross-platform C application program and UI development framework, its development purpose is: once development, everywhere compile. That is, the application developer can run the program under different operating systems only by developing the application program at one time, so as to realize the real cross-platform development. In this paper, Qt is used as the development framework to realize the information exchange of the same instant communication software under different operating systems. This paper starts with SIP and its extended protocol, analyzes the technical requirements of the instant communication system, and studies and designs the general framework of the instant communication system client. The instant communication system is divided into user registration management function module, contact list management function module, IM instant message management function module, Presence presentation business management function module and group management module, etc. Contact list module, IM module and Presence module are the basic business of instant communication system. Contact list mainly completes the maintenance of contact information and the addition and deletion of contacts; the IM module is responsible for sending / receiving instant messages; the Presence module mainly completes the publication of presentation messages and subscriptions / notifications. Finally, the function of the instant communication system is tested. The test results show that the instant communication software in this paper realizes the instant communication functions such as friend list management, multimedia information exchange among friends, and the system is more stable. The interface is simple and friendly and can be used as a reference for product design.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN914;TN915.04

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