Research And Realization Of Coal Mine Multi-service Voice Scheduling System Based On Soft Switch

The production command and scheduling communication system is one of important means during coal mine safety production and management. With the maturity of NGN network, it is a future development tendency of safety production and scheduling to achieve the voice, video, data and other multi-service can be transmitted, controlled and managed by the unified IP load bearing network in the coal mine enterprise. For realizing the voice scheduling function based on VoIP and improving the reliability, flexibility and service extension of voice scheduling communication, one coal mine multi-service voice scheduling system is studied and developed based on soft switch.Through the analysis for multi-service demand in the coal mine safety production, considering the structure of soft switch system, the model of coal mine multi-service system based on soft switch is developed, and the function of multi-service system is analyzed. In the base of coal mine multi-service system based on soft switch, the coal mine multi-service voice scheduling system is designed and developed. Firstly, the registration server and the proxy server are analyzed and designed. The structure of voice scheduling system, the function model and the voice communication system are designed. Secondly, the realization process of SIP protocol in the voice communication is specified. Finally, under the operation environment of Visual C++ and SQL server 2000, in view of Windows Socket, by the hierarchical module soft operation structure, the programming of voice scheduling system is achieved, and the call module, timer module, voice communication module and other public modules are designed and realized. Basic single call, group call, dismantling and inserting randomly, voice monitoring and other core scheduling modules are developed and achieved in the coal mine multi-service voice scheduling system. At the same time, a standard API interface is provided for the integration of video and data services in the coal mine safety production.The test platform of voice scheduling system is built in the laboratory to confirm the system function, and the communication signal is captured and analyzed by the Ethereal protocol packet tracking tool. The test results show that the voice scheduling basis function is completed under the multi-services platform, which can meet the demand of voice scheduling system in the future coal mine safe production.