3 imacs 3 cities, A works to B, B works to C, but A does NOT work to C

Hello. I have a imac with 10.5.1. We have 2 sets of Grandparents each with 10.5.1 imacs, call them GPA and GPB, call us kids.
KIDS can ichat with GPA.
GPA can ichat with GPB.
KIDS can not however ichat with GPB.
To muddy the waters further, if GPA ichats with GPB, then adds KIDS, we can all 3 ichat together.
The problem is KIDS can not ichat with GPB.
Any ideas on what could be causing this?
All 3 sites have imacs with airport extremes.
KIDS are in Denver and have Qwest DSL.
GPA are in Chicago and have Comcast cable.
GPB are in Omaha and have a local phone company DSL.
Any help would be much appreciated!
Thanks. Paul.

If one of the Extremes is in Bridge Mode then it is Not doing NAT.
The issue can be the way each device at each end is doing NAT and some jsut "Don't Play Nicely" together.
See this http://ralphjohns.co.uk/page15.html#CertainBuddy
As the Airports can not do UPnP then the Bridge Mode is one option although it does not help if you have multiple computers.
9:16 PM Sunday; January 20, 2008

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3 imacs 3 cities, A works to B, B works to C, but A does NOT work to C

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