The room before the room.
Most calls begin with someone apologizing for their microphone. The lobby is the minute before that.
What it does
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01
Test your camera and microphone
Before anyone sees or hears you, so the first thirty seconds are not spent finding out something is wrong.
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02
Confirm the call is actually encrypted
Keys are derived on-device and compared, so a tampered connection is visible rather than assumed away.
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03
Choose the music your guests wait to
The host chooses a track and everyone waiting in the lobby hears it, carried on the same encrypted connection as speech. Never uploaded to any server.
The part worth saying out loud
A conventional service would upload your file, store it, and call that a feature. This one has nothing to upload.
Stated plainly: no music catalog ships with this. The lobby plays a file you choose, or a catalog an operator connects.
The waiting-room music, as the host sets it
This is the control itself, not a description of one. You choose a track; everyone sitting in the lobby hears it until you arrive. It is carried as an audio track on the same peer connection that carries speech, which means it is encrypted with the same key and no copy of your file exists on any server. Your file is never uploaded. It does reach your guests, because that is the entire point, and it reaches them the same way your voice does.
No track chosen. The lobby is silent.
One thing worth deciding before you press play: playing a commercial recording to a room of people is a performance, and the license for that is yours to hold. Your own work, a licensed library track, or something in the public domain avoids the question entirely.