The Tele doorbell is your sameboat virtual front door, which may be public or private, here the developers.
The scaled desktop version here is fully operational, red and green flaps collapse and expand the movable doorbell legendbar.

Doorbell white/grayed (offline) if not logged in,
easy peasy social login (main icon)
defaults to Jitsi, later Twitter, Google,
via pluggable back end.