Control Based On The Voice Of Sip Multimedia Conferencing System Design And Realization

As a mechanism to co-ordinate and manage multiple users using different media in different conferences, Floor Control is the key part of Multimedia Conference System.In order to make the control protocol in SIP (Session Initiation Protocol) based Multimedia Conference unify and enhance the functions of the control, we designed a system model using SIP protocol for the Floor Control in Multimedia Conference after analyzed other conference control and protocols. The modle includes session management,conference instance management,user management,protocol management and so on. The Petri Net has been used to analyse the feasibility of the model.The model has been constructed a distributed server for distributing tasks such as meida operation and protocol management to sub servers, which avoided the bottle-neck of single-server conference, and supported server transfer when a sub server crashed. The function of Floor Control lied in different server. Who get floors would be floor holder, he can get floor request by SIP agents and manage resources of conference also, or send request to another servers. The floor holder could control the floors and users, so that can avoid conflict of the conference resource effectively. More, we discussed the implementation of control message, and classed the message into conference command and conference notification while implemented command message with SOAP and implemented notification message with SIP.Finally, functional performance of this full system are tested, Ethereal-capturing Packet software is used to process control and data analysis package, the result shows our system satisfies a basic requirements of design.