iChatting overseas

My mum is currently in New Zealand and tonight we tried audio or video iChatting, but each time one calls the other, iChat "rings" but the connection fails after Accepting. Text chats work fine of course.

could it be the hotel has strict Internet security, or is there something we can try?
 
Yeah, could be only some "normal" ports are open on the firewall/router.
 
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