Here is all the info we have on ICQ:

In ICQ under "Preferences & security", "Preferences" and Connections, click on "I am behind a firewall or proxy" then click on "Firewall Settings". Then select "I don't have a SOCKS Proxy server on my firewall" or "I am using another Proxy server". Click Next. Click "Use the following TCP listen ports for incoming event" and set the TCP ports for 20000 to 20019 for the first user, 20020 to 20039 for the second user, 20040 to 20059 for the third user, etc.

OUT UDP 4000
IN TCP 20000 20019 for one user
OR
IN TCP 20000 20039 for two users
OR
IN TCP 20000 20059 for three users, etc.

Try setting 4000, 20000, 20019, and 20039 as triggers. Then set the public ports to 4000, 20000-20039. If you still have problems, set the public ports to 1-64535 (note: this opens a WIDE range of ports). You can also try putting your machine in the DMZ (go into Misc. Items) and make sure that you have the latest firmware.

MS Netmeeting is a router-unfriendly application simply because of that fact that it uses dynamic ports - meaning that every time the application is opened, it is using different ports to operate. Hence, this application does not work well behind any NAT firewall. Some customers have been able to get this application to work by opening up all the ports for certain triggers.

This is definitely not recommended , here is the information these customers have given us. Beyond this, there is nothing else that can be done. If this info does not solve your problem, please contact Microsoft.

-------------
Triggers = 389, 522, 1503, 1024, 1720, 1731
Incoming ports (the same for all triggers) = 1-64535

All the ports are TCP. You can also try putting your machine in the DMZ (through Misc. Items) and make sure that you have upgraded the firmware on the router.