Research Of NAT Traversal Plan Based On VoIP

With the great success of Internet technology, IP technology has become one of the key technologies in the future information network. Packet switch based on IP and wireless communication based on mobilization have become the mainstream of the communication network. And the new-generation VoIP communication appeared with the birth of the softswitch technology based on multimedia communication. Subsequently, the problem of safety and lack of network address is also be made into an argument matter agenda. On one hand, NAT technology makes performance on safety problem; on the other hand, it also alleviates the pressure of lack of IP address. However, it also has defects and brings out some negative influence. This mainly finds expression in some application layer use which must embed address information into IP data packet, such as FTP, SMTP and so on. As a result, NAT traversal technology becomes an important problem for VoIP technology.Through analyzing and comparing STUN with TURN traversal technology, this paper puts forward a traversal plan that comprehends advantages of STUN and TURN and decreases their disadvanges to the best of their ablities which is named dynamic translation traversal plan . To realize this traversal plan, this paper firstly designs STUN server and TURN server, thus puts forward algorithm realization through analyzing work flow of this system based on this traversal plan. Finally, this paper tests and verifies it through concrete experiment.