基于SIP的分级电话会议系统架构及协议研究与实现

发布时间：2018-05-14 16:15

本文选题：集中分布式 + SIP协议　；参考：《电子科技大学》2014年硕士论文

【摘要】：会议在人类政治、经济、文化及军事活动起着举足轻重的作用,随着社会的发展,会议成为人与人之间越来越重要的信息交流方式,而电话会议以其经济、便捷、高效等优点被广泛的使用。在实际使用过程中,参加电话会议的成员往往具有局部集中广域分布特点,本文将这种网络简称为集中分布式网络。常用的端用户混合模式和集中混合模式有各自的缺点:端用户混合模式对终端能力要求较高,网络中语音数据冗余,带宽使用效率低,容易引起局部网络拥塞;集中混合模式对服务器性能要求较高,不能避免局部网络拥塞,带宽使用效率不高。这两种模式不能适应集中分布式网络的特点。另外,当前对参会人数要求也越来越多,端用户混合模式和集中混合模式受到混音器性能的限制逐渐不能满足要求。本文在深入研究了集中分布式网络特点、SIP协议、H.248/megaco协议以及混合模型的基础上,设计和实现了一种基于SIP的分级混合的电话会议系统。本文的主要研究内容和所做的工作主要包含以下几个方面:1)研究SIP协议标准,通过对SIP协议扩展,实现了分级电话会议创建、管理以及关闭功能的信令控制;2)研究实现了H.248/megaco协议在分级电话会议系统中的媒体控制机制,实现了分级电话会议系统媒体和信令分离,业务和媒体分离,使系统具有很强的灵活性和易扩展性;3)研究对比现有电话会议混合模型特点,提出并实现了适合分级电话会议系统的分级混合模型,分担了混和器处理负荷,避免传输重复的媒体数据,提高了带宽使用效率;4)对分级电话会议系统进行了主要的功能、性能测试,对项目所完成的结果进行了评估,验证了系统的有效性和优越性。
[Abstract]:The conference plays an important role in the political, economic, cultural and military activities of human beings. With the development of the society, the conference has become an increasingly important means of information exchange between people, and the teleconference is economical and convenient. The advantages of high efficiency are widely used. In the process of practical use, the members participating in teleconference often have the characteristic of local centralized wide area distribution. In this paper, this kind of network is referred to as centralized distributed network. The common end-user mixed mode and centralized mixed mode have their own disadvantages: the end-user mixed mode requires high terminal capability, the voice data in the network is redundant, the bandwidth is low, and the local network congestion is easy to be caused; The centralized hybrid mode requires high server performance, can not avoid the local network congestion, bandwidth use efficiency is not high. These two models can not adapt to the characteristics of centralized distributed networks. In addition, there are more and more demands on the number of attendees, and the performance of mixers can not meet the requirements of end-user mixing mode and centralized mixing mode. Based on the in-depth study of the SIP protocol H.248 / megaco protocol and the hybrid model, a hierarchical hybrid teleconferencing system based on SIP is designed and implemented in this paper. The main research content and work of this paper mainly include the following several aspects: 1) study the standard of SIP protocol. By extending the SIP protocol, we realize the establishment of hierarchical teleconference. The media control mechanism of H.248/megaco protocol in hierarchical teleconferencing system is studied and realized. The separation of media and signaling, service and media separation are realized in hierarchical teleconference system. So that the system has strong flexibility and extensibility. (3) comparing the characteristics of the existing teleconference hybrid model, a hierarchical hybrid model suitable for the hierarchical teleconference system is proposed and implemented, which shares the processing load of the mixer. Avoiding the transmission of duplicate media data and improving the bandwidth efficiency. The main functions and performance tests of the hierarchical teleconferencing system are carried out. The results of the project are evaluated and the effectiveness and superiority of the system are verified.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN916.6

【参考文献】