Trying to create a OF Meet by jitsi videobridge the attempt fails apparently because the client placed outside the lan tries to contact the client on the inside lan using it's private IP.
That should not be happening. Each client makes a media (SRTP with DTLS) connection wih the Jitsi Videobridge engine directly and not with each other. That is why the bridge needs a public IP address to be accesible by all clients.
With ofmeet, the signalling is also between clients and the Jitsi Videobridge plugin that acts as a proxy focus point and relays COLBRI messages to the Jitsi Videobridge engine.
JItsi Videobridge is behaving like Jingle nodes to relay media between multiple clients.