Audio Works, Video Doesn't

I'm trying to set up an audio/video "teleconference" chat with a teacher and students for tomorrow, 10/14/05. I'm using a Mac G4 Dual 1gHz and an iSight camera. He's using a PowerBook, also with an iSight. We're both running OS 10.4.2.
When either of us tries to invite the other to a VIDEO chat, we get a prompt that says the video cannot be acquired and the video in the invitation window freezes--even though the video shows as active in our Preview windows.
We have no trouble inviting each other to AUDIO chats.
I also tried using my own Powerbook G4 with the iSight, and the same problem occurred.
It seems this wouldn't be a firewall problem or the audio wouldn't work.
Any suggestions on where to start on trying to fix this problem?
Thanks,
BILL

HI,
I have rebooted in to Panther and attempted to Video chat with Marcello.
WE initially got a message like this
2005-03-08 18:34:32 +0000: xxx did not respond.
Tried to send UDP SIP "invite" to the following IP addresses and ports:
136.xxx.xxx.xxx:10403 192.168.xxx.xxx:5060 10.xxx.xxx.xxx:5060
Tis was solved by turning the Belkin off even though it was not wired to his modem.
Subsequent testing suggest he has a NAT problem.
His ISP canme to his home to set the modem up (which is Unbranded) so he has no access to it.
It is unclear at this stage if the modem is doing NAT and the IPS is also doing it further up the line.
Where he lives only has one provider and it may be a block due to the ISP/telephon co wanting to make money on Interentional calls.
He is going to try and find out this information and chack his service agreement to see if such a block was prestated.
Ralph

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