Research And Application Of Soft Switch Technology In Fusion Emergency Communication System

After the occurrence of accidents and disasters,the rapid deployment and response of the emergency rescue system is particularly important.The establishment of the Ministry of Emergency Management of the People’s Republic of China marks that the construction of emergency rescue system in China has entered a new stage.However,the existing emergency rescue equipment has many kinds and its own system,which cannot achieve unified command and dispatch,and it is difficult to support the efficient development of emergency rescue work in the complex and harsh environment after disasters.Therefore,it is of practical significance to study a fusion emergency communication system based on soft switch technology in view of the demand of post-disaster emergency rescue communication.In this paper,through the study of the implementation technology principle of soft switch,combined with the analysis of rescue communication visualization,information transmission network,unified command and dispatch and other requirements proposed for emergency rescue at the present stage,the business type that the system needs to carry is defined.Combined with the real emergency rescue scenario,the network topology of the fusion emergency communication system is divided into different levels,and the core entity to be designed for the system is the application server.Following the open architecture system of soft switch,the design and development of the emergency communication system supporting the fusion of wide and narrow bands.Based on the modular design idea,the system is divided into communication module and management module.The business carried by the communication module is designed in detail through SIP protocol,including login authentication,single call,group call,meeting communication and so on.Based on the idea of front and rear end separation,the management module is designed and implemented.Considering the complexity of emergency rescue scenarios,the token bucket algorithm is introduced to ensure the high reliability and stability of the communication system.On this basis,the design and development of each functional module are realized.The test results show that the system meets the design requirements and realizes the functions of login authentication,single call,group call,conference communication and so on.The packet capture tool Wireshark was used to capture the signaling interaction process of each functional module,and the analysis showed that each module met the design expectation.The SIPp tool was used to test its performance,and the success rate of registration test and call test was more than 99%,and the average call connection delay was less than 300ms.The test results show that the system basically achieves the design goal and meets the use demand.