I have this problem when I use different wifi, I can't make calls to each other, but when I connect to the same network, I can still make calls to each other. I don't know what's wrong, I hope everyone can help me. This is my source code.
FE: https://github.com/qminhminh/test_call_video_webrtc
BE: https://github.com/qminhminh/call_wbrtc_server