Weird Voice issue on macbookpro..

Hi all..

I'm running SL on a Macbookpro and it usually works smoothly. However, I am connected to the Internet via Airport and whenever I attempt to enable voice (both before logging and during play), I instantly lose my internet connection and thus am stuck. In watching the Airport indicator, the connection usually flickers for a few minutes after initially dropping and then disappears completely. Has anyone had any similar issues with this or any suggestions? Any help will be much appreciated!

I suffer from the same problem. Exactly the same.
I tried to open the ports between 5050 and 5065. When I did that, it worked that day. But the next day the problem was back again.
So I'm also very interested in a solution.

/Sebbe Noel