MSN Messenger Voice Error

Cant start Voice call in MSN messanger?
I can run Netmeeting between these two computers no problem with voice and audio.

But if we try to start a voice call it disconnects almost immediatly, you may catch a word or two?

The computer I’m at (win2K)has been tested with other PC’s no problem. I’m connected to Sympatico DSL with PPoe. The problem machine is Windows 2000 connected to Shaw cable.

I have reinstall Messanger and DirectX-8
The Machine has been updated with latest service packs.

Shaw reports other customers are using this feature with no problem!