The Application Of Multimedia Resource Server In Soft Switch System

As a new force in multimedia communication field, Videoconference is developing at a splitting speed, attracting numerous attentions in the whole industry. The growth of the videoconference can improve other high technology very well. Being a new high-tech industry the videoconference is becoming more popular. And it has a prominent position in the country.Videoconference system is a kind of communication system that can transmit voice, image, text and various other information from one place to another place, and can make the participants have the feeling of being personally present at the conference. Videoconference system is generally divided into point-point videoconference system and multipoint videoconference system. The major videoconference products include video telephone, desktop videoconference system and meeting room-based videoconference system. The videoconference system can realize visible field conference between different places and provide the guest with global videoconference service by adopting world advanced and IP-based video equipment. Through voice and video transmission, the guest can freely choose various control modes for holding videoconference. Videoconference system can also be applied to distance learning, remote medical service and other services that need real-time audio, video data transmission. Video telephone can be used for concurrent communication with a number of persons through ISDN line. Furthermore, the images are clear and there will appear no delay.The system has various functions including picture-in-picture, display of incoming call, message leaving and etc. The videoconference system can be interconnected with any other video devices that are in conformity with international communication protocols and standards. So it requires that the system must have the high quality of service. In order to satisfy the requirement, we must solve the problem as following. One of them is how to transmit the multimedia stream efficiently, the other one is how to meet the need for more and more users can join the same meeting. So the research work of the thesis has the pretty high value of study.The subject of my research project for my master degree is "the application of Multimedia video resource server in soft switch system". This project has been listed in No.863 National Project of China. The main Function of the system is videoconference. The function of the multimedia video resource server is below:Provided the operation for the resource and the service for the audio stream and the video stream. Provided the standard protocol with the H.248 protocol and the H.323 protocol.Provided the interface for multimedia gateway.Provided the interface for application server.Responsible for conference Roster.Responsible for conference conductor.All the function depends on the four modules to realize. The first of them is the dispose for multimedia resource that is responsible for code and decode of video and audio including the mixture of the video and the audio stream The second of them is the call module that is responsible for communicating with multimedia gateway and building the connection between the multimedia resource server and the application server. The third of them is the state machine module that is responsible for transferring from one status to another status. The fourth of them is the decomposition for the message module that is responsible for dispatching parameter from the protocol to the state machine module. All of the modules will run simultaneously. And they communicate with each other based on the interface of the state machine module. I join the team that is responsible for designing and developing the program of the state machine module and the multimedia resource module.The thought of designing program will begin from the call that is prearranged. And then it will show the whole process of the communication according to the parameter(such as the format of coder and decoder) from the super layer. And then MP (multimedia resource module)...