Symmetric network address translation system using STUN technique and method for implementing the same

摘要

In a symmetric network address translation system using a Simple Traversal of UDP over NAT (STUN) technique and a method for implementing the same, a voice over Internet protocol (VoIP) network includes a STUN server for transmitting, to a private network terminal, a public Internet Protocol (IP) address and first port information of a router which is used for a VoIP call. The private network terminal transmits a session setup request message, including the public IP address and the first port information of the router, through its private IP address and a second port, and the router maps and stores the public IP address and the first port information of the router, and the private IP address and the second port of the private network terminal, and routes a packet received through the public IP address and the first port to the private IP address and the second port. Thus, a VoIP call is performed using the symmetric network address translation system to which the STUN technique is applied.