H.323 BASED NETWORK SECURITY SYSTEM AND A METHOD THEREOF, PARTICULARLY RELATED TO OPENING A RANDOM PORT ON A FIRE WALL, AND TRANSMITTING ALL H.323 MESSAGES TO THE OPEN PORT, IN ORDER TO AUTHENTICATE THE MESSAGES

摘要

Purpose a: H.323 base network security systems and its method are arranged to open the random Interface on a firewall, to transmit all H. by random Interface323 message are acted on behalf of to warning, the calling that a fire wall controlling system authenticates to a doorkeeper can be transmitted through to guard against agency, thus cumulative H.323 base networks safety. Construction: warning agency (320) verifies H. by a random Interface of a firewall (200)323 messages received, only transmit authenticated message. The source port number that one fire wall controlling system (340) is identified by call setup message is transmitted from warning agency (320), so that firewall (200) can open port corresponding with source port number. One H.323 doorkeepers (360) call transmission establishes message, receives information transfer message by load. One H.323 gateways (380) receive call setup message, verify message.