Research on IP net telephony system based on FPGA telephone terminal

This paper presents the IP net telephony system using computer network, and proposes the design proposal based on FPGA telephone terminal. The hardware circuit of IP telephone terminal is designed using FPGA device EP1C3T144C8. In order to control the telephone terminal, the system uses a FPGA chip inserting the 51IP core with TCP/IP protocol. The system uses speed compression algorithm on ADPCM to realize the compression of 16kbps voice signal. The software for the manage of the IP net telephony system is programmed in VC++ platform. This system can realize the communication through computer network, so it has widespread application prospect in many fields such as enterprise, education, science and technology, electric undertaking, bank and so on.