A nix on the intercom though - fit a light switch outside and a bulb inside the room. Or be prepared to have a lot of takes with a long "beeeeep!" special effect.
Yep, no doubt about that, especially once our three year old figures out what that new box with the inviting red button actually is. Lots of takes with "beeeep...hello pappa"... ???
The light bulb is a good idea, I'll definitely do that.