Just out of curiosity did anyone test how these group conference video calls work? As far as I know no other XMPP client supports them.
They’re using the old Muji protocol right now. It used to have some experimental implementations, but this is maybe the first “release grade” implementation.
Basically, it’s pure p2p. Every participant connects to every other participant and they all send all media directly to each other. It’s fine for 3 or maybe 4, but obviously not for big calls.