The bot joins as a participant the others see in the call.
The bot can post to the meeting's chat (the notice, and its short form for a late arrival).
The bot reads the meeting's chat, which is where it watches for the stop phrase.
How the audio reaches the listener: published into a room, or the platform's own media stream.
The provider records no audio.
The provider does not transcribe; the host's listen session does.
The provider keeps no copy of what it heard or read.
How a participant stops the bot: the stop phrase in the chat, or a link the notice gives.
What a provider declares about itself. The notice text and the stop path are written from this, never by hand per provider.