Channels (by name) the instance enables for voice sessions.
When the token expires (epoch ms), on THIS browser's clock: the server's expiry less the offset learned from the
token's iat, so expiresAtMs - Date.now() is the time the token really has left on a device whose clock is off.
The agent the instance pins. The server only lets this guest start a session with it.
The server's hard ceiling on a voice session, in minutes, when it set one.
What the server decided for this guest.