Help! cant seem to get video chat working

Hi can anyone help me as I'm going mad!
trying to get a video chat going - text is fine and then invite my partner to chat and click on accept but then but we keep getting an error message up at both ends...
there was a communication error during your chat
did not receive a response from "my partner"
other computer is a macbook pro 2.53 GHZ intel core 2 duo running os 10.5.5
any suggestions/ideas/fixes greatly appreciated!

Hi
First have you set the Quicktime streaming setting, goto sys prefs/quicktime/streaming/streaming speed, set to 1.5mbps
In ichats prefs click on video and change bandwidth limit to none.
Restart iChat.
And try me defcom1 .mac account.
Tony

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Lets check the Port Forwarding at your end.
Does this Zyxel have UPnP at all ?
If so use that and disable the Port Forwarding.
If not then these ports need to be forwarded.
I will list with Protocols as some device need these.
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TCP 5220, 5222 and 5223 for Jabber (the last is for OS X servers and GoogleTalk)
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UDP 5678 this is where the visible invites come and go out on.
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import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
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In fact, paint events delivered by the operating system may even be delivered
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