If you notice a specific extension ringing, and you know that person is not able to take the call, you can take the call using the ‘Call Pickup’ feature. To do this, type:
*20* <extension number>
This will redirect the active call from the specified extension to your extension. You can also retrieve a call from a ringing extension without specifying the extension number. To do this, type *20* followed by the send key. This will redirect the first available active call to your extension.