分布式VoIP系统中的业务连续性

Recent years, the telecommunications network come across the problems like complexity of network architecture and high cost deployment , meanwhile in the Internet, distributed VoIP system with low-cost deployment, high scalability and high reliability rapidly occupies most of the multimedia telephony service market. The essential reason is that serving node organized by P2P technology in the service system are self-organized, which means nodes can dynamically join and leave the network without manual configuration or upgrade operation. However, precisely because of the dynamic self-organization, node joining and leaving make it unable to guarantee the service continuity for users, which reduces the quality of VoIP service. To solve the problem, this paper propose the method like migration delay and calling redirection to achieve seamless joining and leaving.