[Freeswitch-users] incoming calls with video

Hi everyone, I´m new in Freeswitch and have now a simple freeswitch configuration, with one I can just make outgoings and incomings calls. I have been playing a little bit with video Calls but it doesn´t work properly. It is possible to make video calls outside the network, but they don´t come in. How do I have to do the configurations, in order to be able to have incomings und outgoings video calls? Thank you very much in advance. Best regards, SC