Buddy calls me successfully, but I cannot connect when he calls me

I have iChat 5.0.3 on 10.6.5 on an MBA (late 2010).
When I video call a buddy, I get the connection failed as he "failed to respond message", but if he calls me we connect successfully and the video call is perfect.
Before I start to tinker with router settings, does anyone have any advice here please?
(sorry if this has been addressed in the fora, but I couldn't find the right search string!)
Thanks

Hi,
iChat in Video (or Audio Only) chats is a two stage process.
First the Visible Invite is send by the Buddy.
iChat then starts the SIP Invite (It is this that the Log is about and is what is "not Responded" to)
This SIP bit sends another Invite (it is in fact on another port).
Part of the Process checks that the IP that any response is coming from is the same one the Visible part of the Invite went to.
To receive Visible Invites port 5678 has to be open in any router.
The SIP bit needs ports 16393-16402 to be open. (iChat only uses one of them in 1-1 chats the others are effectively "Spares|)
Is your Buddy actually seeing the Visible Invite ?
Of not he most likely needs to open port 5678 and 16393-16402 (ON UDP Protocol if he has to state Protocols).
If his router has UPnP this may be easier to use if he has multiple computers at his end.
This is an Enable/Disable settings and then allows the apps to tell the router which ports to open (they close again on most routers after a period of Non use)
In total iChat uses 20 ports.
One of these, used during Screen Sharing is random so it is difficult to set this port in Port Triggering or Port Forwarding.
7:09 PM Wednesday; January 5, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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Buddy calls me successfully, but I cannot connect when he calls me

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