Click the Firewall link near the left hand side of the page.
Click the Expert link near the top of the page.
We will list a series of lines here that will show you exactly how to setup Zone Alarm's firewall for CUseeMe-CUworld. Go ahead and enter the settings shown below into the Add Rule menu.
You should see another page of settings below that need to be added to Zone Alarm. Open up a new Add Protocol page and enter those settings.
When you are finished, click the Apply button at the bottom of your screen. And that is it! You are done!