Modified NAT firewall traversal method for SIP communication

摘要

A modified NAT firewall traversal method for SIP communication is based on the common SIP network phone communication protocol, and is aided by Interactive NAT Traversal (INT) and pre-established media session ideas to accomplish the object of transversing NAT firewall. Users of private IP located within different NAT firewalls can therefore directly transmit voice packets by means of peer-to-peer transmission without the need of any proxy server of voice packets.