IChat problem - is router the problem and can I do anything to solve it?

Question

I am in Ireland at the moment visiting my family. We all have Macs - IBook G4, MacBook and mine is MacBook (new this August). I can use iChat (video etc) with my family back in the U.S. and with my brother-in-law who lives in Ireland. The problem is with a iBookG4, which my sister has. She has a Netopia router with Eircom (on DSL). We've been able to video conference with each other in the same house, but neither of us can do a video conference with anyone else, so we think that the problem is with the router. It is "Type 0X21" and has 12 VDC, 800mA - this is written on the backside of it. Not sure if that means anything, but I thought I would include it, just in case. Is there anything I can do via either computer to access the firewall(s) in the router that I could change? Or any other suggestions? I have already set the Quicktime speeds etc. like suggested in other forums. And as I can iChat very successfully from my brother-in-law's house, I guess the problem does not lie within my computer.
Thanks - Geraldine

Answer 1

I was able to solve the problem. I contacted Eircom and the agent told me to set my firewall at "low" - and that helped for a while. I was able to video conference from my computer and my sister's. Then they both stopped working again. My husband did some research (not sure where) but he gave me some port numbers to add and that seemed to do the trick. Once in a while I cannot make a connection, but I think that is due to traffic on the DSL.
Just in case this might help some other Irish iChatter with Eircom and Netopia
here is what my husband found for me
Apple Menu ->System Preferences ->,from View Menu ->Sharing ->Firewall tab -> New ->Port ->Other ->Port Number (Range or Series Field) type in:
5060, 5190, 5297, 5298, 5678
In the Description Field type in: iChat AV.
Click OK.
Geraldine