MSN Messenger 6 and voice chat

I can't get MSN Msg 6 to connect for audio chat. I've tried with several different people and it never works. It either says the chat has ended or that it couldn't set it up. I'm able to connect for voice chat over AIM. But I want to do it in MSN because of the webcam. I set my Kerio firewall to its lowest possible security setting and MSN still won't connect for voice chat. Any idea what could be wrong?

 

I suggest changing the rule for MSN messenger to TCP and UDP protocols and for both directions.

 

MSN Msg is allowed full access to the Net. When I check my firewall's list of programs it shows MSN Msg on UDP and TCP out and UDP and TCP in. What else do I need to do? AIM connects for voice chat OK, so I know it's just an MSN problem, and I'd really rather use MSN.