Communication Error - audio and/or video

Since I've upgraded to Leopard (and three of my friends are experiencing this as well), I can no longer get audio or video chats to work. iChat reports a communication error with an option to send it to Apple.
I do not have my firewall turned on, but I am behind a hardware firewall. The configuration of that firewall is still the same and I followed the Apple document outlining what ports to open back when I did set it up.
Other friends of mine who are not behind firewalls are having the same problem and we're all frustrated. They can't communicate with each other as well, so it's not just me I'm referencing.
This used to happen all the time when Tiger was new (and seemed to go away after several OS updates), and now Leopard seems to be doing the same thing.
I would appreciate any help!
Chris

Same here: Can`t start a video chat or screen sharing with iChat, while Skype works PERFECTLY.
The strange thing is: iChat worked just fine one the first time I wanted to share my girlfriend`s screen. However, 2 days later it didn't anymore. I swear to god: We didn't change anything. REALLY annoying!
The only thing that still works in iChat is text-chatting.
Apple must have gotten a ton of these by now:
iChat Connection Log:
2007-11-10 12:27:46 +0100: AVChat started with ID 3344422678.
2007-11-10 12:27:46 +0100: tomwiechert19779: State change from AVChatNoState to AVChatStateWaiting.
2007-11-10 12:27:47 +0100: 0x71e2a0: State change from AVChatNoState to AVChatStateInvited.
2007-11-10 12:27:54 +0100: 0x71e2a0: State change from AVChatStateInvited to AVChatStateConnecting.
2007-11-10 12:27:54 +0100: tomwiechert19779: State change from AVChatStateWaiting to AVChatStateConnecting.
2007-11-10 12:28:14 +0100: 0x71e2a0: State change from AVChatStateConnecting to AVChatStateEnded.
2007-11-10 12:28:14 +0100: 0x71e2a0: Error -8 (Did not receive a response from 0x71e2a0.)
2007-11-10 12:28:14 +0100: tomwiechert19779: State change from AVChatStateConnecting to AVChatStateEnded.
2007-11-10 12:28:14 +0100: tomwiechert19779: Error -8 (Did not receive a response from 0x71e2a0.)
Video Conference Error Report:
25.623758 @SIP/SIP.c:2719 type=4 (900A0015/0)
[SIPConnectIPPort failed]
27.624589 @SIP/SIP.c:2719 type=4 (900A0015/0)
[SIPConnectIPPort failed]
59.669776 @SIP/SIP.c:2719 type=4 (900A0015/0)
[SIPConnectIPPort failed]
61.671262 @SIP/SIP.c:2719 type=4 (900A0015/0)
[SIPConnectIPPort failed]
1823.615222 @SIP/SIP.c:2719 type=4 (900A0015/0)
[SIPConnectIPPort failed]
1825.616990 @SIP/SIP.c:2719 type=4 (900A0015/0)
[SIPConnectIPPort failed]
1925.418483 @SIP/SIP.c:2719 type=4 (900A0015/0)
[SIPConnectIPPort failed]
1927.419368 @SIP/SIP.c:2719 type=4 (900A0015/0)
[SIPConnectIPPort failed]
4697.478249 @SIP/SIP.c:2719 type=4 (900A0015/0)
[SIPConnectIPPort failed]
4699.478889 @SIP/SIP.c:2719 type=4 (900A0015/0)
[SIPConnectIPPort failed]
[]

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