No audio or video in internal network conference

Hi there, I am installing Jitsi for video conference only in my company network. I can start a room and see when other participants are in the room but there is no audio/video communication only chat works. I’m using debian 10, my server is on 10.x.x.x network and I have generated a self-signed certificate. As I will use jitsi only for video conferences in my company network do I need a public IP?

Thanks for all help in advance.

Make sure no firewall is blocking udp port 10000. You should be able to connect and to internal address.