Hi,
I know this question is not directly related to Nextcloud but perhaps somebody using Spreed.Me could respond…
Actually, the desktop client 0.9.0 is built (hard coded ?) to register only with Spreed servers. Could it be configurable to register with our own privates Spreed WebRTC-server ? Should be…
That’s on the wishlist…
Aah, OK, Thank you ! 
(i didn’t expect to find this in a “Nextcloud integration” topic because spreed-webrtc server is not dependant of a Nextcloud installation and can (should ?) be use by many differents desktop clients, no ?) VLC for example could be one if WebRTC protocol was supported.