Both can connect to test sites but not videochat with each other

I am using a 2GHz PPC iMac on 10.4.6 with external iSight. I can see the Apple ad from one of the test sites. My wife is using a G4 PowerBook running the latest Panther OS with external iSight. She is in a hotel but can also see the Apple ad from the test site. When she was home, we could videochat over Bonjour.
But, while she is in the hotel out of town, we couldn't videochat with each other. Whether one initiated or the other did, we both get the "XXX failed to respond" message even though we obviously did accept the videocall.
If we both can videochat with the test sites, how come we cannot videochat with each other?
Given the above, I hope some experts can rule out a bunch of stuff and let me know the finite (and small) set of potential reasons affecting our situation so that I can work on resolving this efficiently.
What could be the likely problem?
On my side, I use an Apple AEBS that uses DHCP and NAT but my iMac is manually set to 10.0.1.201. I have set the ports in Firewall but even when I turned off Firewall it did not work.
Any help is much appreciated.

Hi Heng-Yee Yong,
The test sites are most likely set to have the ports open by UPnP which does not use NAT.
If you modem is routing and is using Port Forwarding and the Airport is as well then you have two lots of NAT going on at your end.
I would Open Airport Admin Utilty (Applications/Utilities) and log on to the Airport
Go to the Network tab.
Deselect Distributing Addresses which wll trun off NAT in the Airport and make it a Wireless access device.
This means your computer will have to take an IP form the Modem.
This may not be rquired if the modem id is Bridge mode itself as this measn it is not routing and all port will be open without the use of NAT.
This App can help identify if NAT is a problem
http://bleu.west.spy.net/~dustin/projects/natcheck.xtp
Or at least whether you have Consistent NAT or not.
8:50 PM Wednesday; April 26, 2006

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