"Voice chat ended: No Media Received. This may be caused by firewall configuration problems"

Good Afternoon, I am having a problem, need help.

When I speak first by Voice chat works, the second time, does not work. States the following: “Voice chat ended: No Media Received. This may be caused by firewall configuration problems”. I need to disconnect and reconnect to run the Voice chat again. It only works the first time, does anyone know what should I do?

Thanks,

Marcelo Giovanella