IChat won't do video conf outside the house. . .Skype works . .Help!

Question

When I try to do a video conference between my home Imac and my Macbook and am in my house it works great. However, I don't really need it for this. . .when on a business trip (or even a neighbors house) I cannot connect. I usually get the #8 error about communications error. Both systems can connect to the test IDs and conference fine and I can do a conference in my house over either wired or wireless.
I tried Skype and it works anywhere but the quality is not as good as IChat (audio - hear weird bells).
Anway, I have look over lots of docs and not sure what to do. here is my setup.
Verizon FIOS. .D-Link Router DI-604 with 4 ports (one for each mac, one for printer, and one for wireless router).
This is frustrating. . don't understand why Skype works every time but IChat won't as soon as one of my machines is outside the home network but the test calls all work.
Help!

Answer 1

Hi Adam,
Umm
Questions I would ask if it were your end at home.
How have you got the ports opened in the Modem for iChat ?
I can not see in these pics that it has UPnP which would allow multiple computers
You will need to do Triggering to allow multiple computers to use the same ports. Use the Instructions on that link for method.
They show look a bit like this Linksys but is seems you can add several single ports together rather than the Linksys one at a time and group method.
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If you have a setting similar to the above that works at home but not away from it I would go to iChat Preferences > Accounts > Sever Settings tab and change the port form 5190 to 443 (this not only help with login in some cases but also with A/V chats).
If this does not help then tell us what settings you have on your Mac
Firewall On/Off ?
Ports set in Firewall ?
Protocols used ?
2:20 PM Saturday; January 27, 2007