= Door is closed.
= Door is open.
= Door is locked.
= Bolt is locked, but door is open!

= Light is off.
= Icon is on: Lights are on, need to be switched off manually.

: Microphone is switched off, no announcements possible.

: Microphone is switched on, announcements are possible.

: Microphone connection is blocked; possibly because a connection exists from another remote station.