基于SIP协议远程教学系统模型

Model for SIP-based distance education system

通过对SIP协议的会话机制和特性的分析,发现其在会话方面具有显著的灵活性和扩展性,适用于广域网的架构和媒体流的传输.SIP紧耦合模型初步揭示了远程教学或会话的基本原理;在此基础上将核心控制和媒体混合功能在物理上分离,增加Web服务器以提高终端用户与远程教学系统的交互性,可构建基于三个集中服务器的SIP远程教学系统模型,并提出相应的拓扑结构.该模型的教学功能和工作机制主要体现在:远程教学课堂的创建、加入、结束、状态通告及资源控制等方面.

Through analysis of mechanism and characteristics of Session initiation protocol （short for SIP）, it is found that SIP possesses prominent flexibility and expansibility, which meet the requirement of Internet infrastructure and media flow transmission. To some extent, tight-cou- pling model based on SIP reflects the fundamentals of distance education and session initiation. Furthermore, while key control and media mixer are functionally separated. A Web server is add- ed to improve mutual communication. The model SIP-base distance education system with three centralized servers are constructed and the corresponding topology structure is proposed. The mechanism and education function of the model are embodied and realized through several aspects, such as distance class creation, participation and termination, state information notifica- tion and education resource control.