Based On The H.323 Telephone Network Gateway Design And Development

With the development of computer networks and voice processing technology, real-time voice can be transmitted over the Internet, thus gives rise to the appearance of the IP telephony. Thanks to the voice compressing technology, the amount of data transferred over the Internet has been largely reduced. By using packet switch technology, the cost of IP telephone is remarkably lowered because of the full use of the network resources. Recently IP telephony technology has matured comparatively, and attracted a large number of customers.The development of IP Telephony technology is very fast. Thought here has been integrity resolution, many problems should be paid more attention, such as QoS(quality of service) and network operating system. At present, most of IP Telephony system based on ITU-TH .323 standard, while some based on IETF SIP.This dissertation introduces the programming idea of the gatekeeper system simply and discusses the key point of programming. Then, the frame and realization of the gateway program are discussed in details. In order to realize the real time transmission of voice and the credible transmission of signaling online and complete the control of flux of gateway communication, we often improve the structure of the gatekeeper program to adapt it. Finally, the debugging procedure is introduced.