Problemas with video call messenger


I have this situation:
I’ve Comodo installed in two machines that also have a web cam. When I want to establish communication between them through Video Call using Messenger, the communication can’t be established. The process start but never display the image and then messenger returns to its normal status. Comodo doesn’t report any alarm, but in the Activity → Logs tab say Inbound Policy violation. I’m using Windows Live Messenger 8.1

In resume: I can´t establish video call (using Messenger) communication between two machines running Comodo.

Can anyone help me.

Thanks in advance