1. go to the quality of service and firewalls screen (system info ] admin setup ] lan/h.323 ] h.323 ] qos).

    2. select use fixed ports.

    3. select system is behind a nat.

    4. enter the nat’s external ip address into the nat outside (wan) address field.

    write down the fixed tcp and udp port numbers displayed on this screen. these numbers typically are the following default numbers:

    tcp: 3230 to 3231

    udp: 3230 to 3235

    5. in your nat, reset the fixed ports from step 4 to be permanently open, and redirect them to the ip address of your viewstation.

    6. to accept incoming calls, open and redirect port 1720 to the ip address of your viewstation.