Can't initiate video conference in iChatAV (using airport express)

I have a variation of a problem with starting video conference in iChat via airport express - did read previous posts to the subject but did not find a solution yet.
The problem is: I can't initiate the video conference with my new intel core duo iMac - but I can have one, when the user on the other side initiates it.
I assume this has to do with port forwarding on airport express, since I also have an older iMac G4 which until now was connected to the internet via Siemens ADSL modem C010-I(ethernet) and it worked just fine.
My firewall is off.
I tried to forward ports 4099, 5190 and 5193 (as suggested by www.portforward.com) but that didn't seem to solve the issue. Any other ideas, please?

Hi Reed,
If the modem routes then there is a chance it is doing DHCP as default if you have not changed it.
You can check by connection direct to the modem with your computer and then doing this:
Go to System Preferences > Network.
Select Built in Ethernet in the second drop down.
Select the TCP/IP tab
If the IP listed below the Using DHCP drop down appears the same as when you go here then the modem is in Bridge mode. If it appears to be in one of these groups:
192.168.xxx.xxx
10.xxx.xxx.xxx
or 172.16.xxx.xxx through 172.32.xxx.xxx then the modem is routing.
The Airport does DHCP by default as well.
You do not want two DHCP servers.
This can be turned off in Airport Admin Utility found in Applications/Utilities
Log in to the Airport in the samll window and then go to the Network tab
Deselect Distributing Addresses if the modem is routing.
12:42 AM Saturday; July 15, 2006

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Can't initiate video conference in iChatAV (using airport express)

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