【摘要】 提供优质的IP会话是未来多媒体通信业务的关键问题。会话初始协议(SIP)是多媒体数据和控制体系的一部分,是一个基于应用层的控制协议。文中提出了一种在现有电话通信系统的基础上,不需要建立新的体系结构,经简单改造即可实现的新型IP电话系统的构想。该新型IP电话系统可以实现更廉价和便捷的IP通话。文中阐述了设计和实现方案,给出了该IP电话系统的网络框架,讨论了SIP的工作原理和在该系统中的实现。更多还原

【Abstract】 For multimedia services in the future, to provide high quality VOIP is a key problem. SIP (Session Initiation Protocol) is a part of multimedia data & control system, a control protocol in application layer. This paper presents a new IP phone model which could be implemented through a simple amendment over the existent system without setting up a total new one. The new IP phone system could make communication cheaper and more convenient. This paper still introduces the design, realizing scheme and the net frame of it, discusses the work principle of SIP and its implementation in the model.更多还原