The Design and Application of VoIP Voice Communications System
Abstract
With the rapid development of computer and network technology, multimedia telecommunications network has become the focus of attention. Computer Network Technology has not only indisputably become a leading data communications technology , but also demonstrated a strong competitive edge in the field of Speech Communication which is the main traditional telecommunications business. The Internet has already become a unified global network.Its unified network layer and transport layer protocols lay a foundation for the integration of the telecommunication network, computer network and the cable television network. So VoIP will be the guiding principle in the development of next generation voice network.
In the last two years, along with the sudden growth of global users of broadband access, the push of policy and investment, and its constantly improving , VoIP technology finally become one of the hottest topics again after many years of silence. According to the development trend of VoIP, SIP will gradually replace H.323 to be the core agreement of VoIP, because of the lower complexity and better extension. So the extension of the value-added business and the VoIP system based on SIP will has great research potential and useful practical significance.
Against such background, this paper firstly shows the significance, background,development potential of the selected topic. Second, it describes the principle and process of SIP, the correlation technology of VoIP system.Besides, we test it by experiment. On this basis, according to the requirement of user and the survey, this paper presents a comprehensive and practical solution to the VoIP system of Anhui University and continually corrected and improved the system until formed a satisfied and feasible system. This solution is not only to achieve a simple voice phone functions, but also make a breakthrough of the SIP-based extensions. It achieves conference call, call transfer, accounting management and so on. And its function can be extended.
Finally, though completely test of this VoIP system, it is found that function is easy and practical, operation is stable and reliable, service is rich, fully corresponding to the demands of all levels of users, and it can provide a wonderful communication platform for all users. The application of this VoIP system not only improves society productivity and saves costs, but also improves the quality of peoples' lives, builds a harmonious and efficient society.
Key words: voip ; sip; rtp; sdp; ip telephone;
