Sipear: A P2p-based Architecture Voice Communication System

Recently,more and more attentions are focus on the research and applications based on the networking.Among which the p2p applications are development quickly.And this kind of application contains the modules of overlay networking,channel encoding, networking transmit and security.According to the theory,the overlay networking are category to two main kinds,the first is centralized and decentralized networking while the decentralized networking dismiss the defect of single point failure but with the search algorithm of flooding search.At the same time,asymmetric of networking cause the transfer rate vary and also the difficulty of directly connect between ends increase.And the existing applications such as QQ and MSN have the single point defect while the application of Skype works well but for its business issue.In this paper a new architecture is proposed which using decentralized overlay networking based on P2P.Comparing to existing system,the system has four sound advantages:high extension and robustness by using decentralized overlay system based on P2P;good stability by using modified DHT search algorithm;high success rate for introduce port prediction into NAT traversal;transmit efficiency by using longest prefix match while distributed relay node.After the implementation and test on both inner simulation platform and internet,a conclusion that the propose system performs well user scalability,search efficiency and voice quantity is draw,so it can provide practical and research value in media and any related application.