Rural Grassroots Platform Design And Implementation Of The Meeting

The multimedia conference application in the traditional telecommunicationnetwork is difficult to be applied in public, because of its complex realizationmechanism and costly investment. On the other hand, the close framework of thetraditional telecommunication network and the low bandwidth make it difficult torapidly achieve development and deployment of multimedia services, and meet thebandwidth demands of a large number of multimedia users. So the high-bandwidthmultimedia conference applications which can meet large users’ needs require theemergence of new technologies.With the development of VOIP technology, there are two systems rising up-H.323and SIP. H.323has considered the request that it can interflow with the originaltelecommunication system at the time of the design. So it gets support from alreadyexisting telecommunication equipment manufacturers. However, the designer of SIPcontinues putting the key point on IP network, adhering to the style of simple, open andflexible principle. However, in the aspect of connection with the terminals of CircuitSwitching Network, SIP has not offered abundant consideration. Whereas, thetechnology of H.323is mature, and the products based on H.323are still the mainstreamof the telecommunication market. Therefore, in order to protect the existing investment,and save the cost of network construction, the research of the multimedia conferencesystem which can integrate H.323and SIP has great significance and economic value.Through the deep analysis of VOIP system based on SIP and H.323, this thesis putsforward a scheme to design a VOIP soft-switch system which can integrate H.323andSIP, converting the H.323and SIP protocol in the Proxy Server. According to therecommend standard of ITU, this thesis puts forward an audio mix model,implementing the mix function in the Media Server.Additionally, implement themulti-point control function in the Location Server, and design a service processingmodule at the upper layer of LS. Then the three loosely coupled sub-systems consist ofthe VOIP multimedia conference system. Because the communication with LS, MS andPS is using private message, LS, MS and PS can separately run on different servers. So they can rapid dispose and put into use.The focus of this thesis are the research on the integration of H.323and SIPprotocol, and the design and implement of audio mix model.In the last, this thesis putsforward a performance optimization scheme using DSP technology and some goodsuggestions for the further research.