At my previous office, we had to wait 1+ month to get badges so we used to do this all the time to get people to come down to open the door. No need to pick up.

At my previous office, we had to wait 1+ month to get badges so we used to do this all the time to get people to come down to open the door. No need to pick up... if it rings twice, come to the front door and open it.