A Design Of Wireless Communication System For Voice Based On VoIP

VoIP (Voice over Internet Protocol) is a technology using packet data based on IP for voice transmission,which is the hot spot of research in the next generation network (NGN).With the popularity and improvement of Internet,depending on the low cost, effective technology and open platform,VoIP has been the important role and direction of the communication in the future.Consult a lot of related literatures and designs,the thesis proposed a design and implementation of the wireless voice communication system based on VoIP, to meet the needs of factories dispatch.VoIP-based wireless voice communication system is an important part of the production activities,which adopts wireless access technology,and has the functions of voice dispatch such as general call, group call,conference call and forced release to make use of the resource efficiently.This paper described the design and implemen- tation of the wireless communication system for voice based on VoIP,including the analysis of needs,the design of hardware platform,the signalling analysis of SIP,the design of software and the system testing.The key technologies about VoIP and wireless access include SIP,RTP,QoS, WiFi and WMN.In the analysis of needs propos- ed a scheme according to the needs and features of the production. The hardware platform design introduced the srtucture of Asterisk,the terminal platform with hardware schematic design,qualifications of the wireless access point and the wireless networking.The analysis of SIP gave the signalling flows for voice dispatch,and also proposed the P2P and dynamic priority to keep the system stable and effective.In the software design,the software flows of the Asterisk server and the terminal was analyzed.Finally,the system was tested about the functions of voice dispatch and the transmission performance of the wireless networking.The design of the system considered the actual conditions in the factory,and solved the dispatch task of production.The system has achieved the development of the related functions and the installation in the worksite,and the porformance of the running process in VALIN LY STEEL is responded well.