Here is a portion of the description from the Legend Feature Reference guide:
Individual Pickup
Individual Pickup can be used in the following ways:
• EXTENSION PICKUP. From the display, select Pickup and then dial the extension number of the call to be picked up. Alternatively, set a programmed Individual Extension Pickup button to pick up calls on one specific extension. If that extension has more than one call, the first call sent to the extension is picked up. To pick up a call parked by an operator, select Pickup from the display or press the programmed Individual Extension Pickup button; then dial the park zone.
• LINE PICKUP. From the display, select Pickup, then dial the line number (801–880) to select a specific outside line from which to pick up a ringing or held call. Alternatively, a programmed Individual Line Pickup button can be set to pick up calls on one specific line. Line Pickup also can be used to make announcements through the loudspeaker paging system.
• GENERAL PICKUP. Multiline telephone users can program a general-purpose Pickup button to pick up calls on either extensions or lines. When a general Pickup button is used, enter the line or extension number for the call to be picked up every time the button is used.
If you program it on a button the code would be *9 for general Pickup or *9+ Station number for Individual. By using this feature you can pickup calls ringing on the console whether it is a DLC or QCC type.
....JIM....