文档介绍：华中科技大学
硕士学位论文
基于SIP的IP电话系统的设计与实现
姓名:胡亨卓
申请学位级别:硕士
专业:软件工程
指导教师:高建生
2009-11-07
华中科技大学硕士学位论文
摘要
随着网络应用的迅猛发展,VoIP(Voice over IP)技术得到了广泛应用。并且随着
近年 lP 网宽带业务的蓬勃发展,基于文本的多媒体通信系统标准 SIP(Session
Initiation Protocol)在视频会议和 VoIP 业务中得到了越来越广泛的应用。文章针对用
SIP 实现 VoIP 业务的关键问题进行设计与实现,为最终实现 VoIP 业务提供了支持。
VoIP(即 IP 电话)控制信令体系主要包括 ITU-T 的和 IETF 的 SIP。SIP
是 IETF(The Engineering Task Force)的 SIP 工作组发布的一种在基于 IP 的网
络中实现多媒体通信的应用层信令协议。同相比,SIP 具有简单、易于实现、
可扩展性等优点,在视频通信中有广阔的应用前景。
文章详细分析了系统的功能、组件、消息以及结构,例如:用户代理,代理服
务器,重定向服务器和目录服务器等。在 Linux 环境下,将系统程序的源代码编译
通过并成功运行。
在网络负载较重时,系统仍然能够保证良好的通话效果。现已成功产品化,并
推入市场,取得了良好的经济效益。

关键词:VoIP SIP协议用户代理代理服务器
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华中科技大学硕士学位论文
Abstract
Voice over IP technology develops with the rapid development work
applications. And with the flourishing development of work broadband services in
recent years, the text-based munication system standard SIP has got more
and more extensive application in the video conference and VoIP services. The paper
engaged to design and implement key problems of VoIP service based on SIP, which
provides a strong support for VoIP.
VoIP (so called IP telephone) communication controlling system mainly can be
described as for ITU-T and SIP for IETF. SIP is an work multimedia
communication signing protocol which is defined by the SIP work group of IETF.
Cornparing with , SIP has good extensibility, and is so simple that it is easy to
implement. The prospect of SIP being applied in municaton is very fine.
This thesis details functions, components, messages and structures of the system, and
it involves user agent, proxy server, redirect server and directory server, etc. Under the
LINUX environment, the system codes piled and are running suceessfull.
The system works well when work is busy. This system is now applied, gain
the great economic benefits and launched to market.

Key words:VoIP SIP protocol User agent Proxy server
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