Multiple Video Chat works between three but not between two of the three

I'm connecting three Macbooks using iChat AV. If I initiate the session the other two accept and we have a three way video chat. Either of the other two can initiate a video chat with me. Problem:
neither of them can initiate a video chat with the other. All three Macbooks seem to have the same preferences etc.
Solution?
Thanks.

Hi,
How are the ports opened in the Connection device (modems and routers) at each end ?
Sometimes two modems don't like the way the other does NAT
http://www.ralphjohnsuk.dsl.pipex.com/page15.html#CertainBuddy
8:02 PM Thursday; October 11, 2007

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