Call pick-up is a feature used in a telephone system that allows one to answer someone else’s telephone call.
The “call pick-up” feature is accessed by pressing a preprogrammed button, or by pressing a special sequence of buttons on the telephone set.
In places where “call pick-up” is used, the telephone sets may be divided into groups. Under such an arrangement, using “call pick-up” will only pick up a call in the same group.
There are two main types:-
Group call pickup, this allows you to collect a call from any ringing phone that is in the same pickup group as you, if there were more than one phone ringing then you would have no control over which call you collected.
Directed pickup, this allows you to pickup a call at a specific extension, maybe you're in another office and you hear a phone ringing and wonder if it's yours. You dial the pickup number and your extension, and the call will only transfer if it is your extension.