To put a call on hold and answer from another extension.

Press "Flash" or tap the hook switch

Press * 4 4

Dial the extension number where you want to park the call followed by # , or enter # directly if you want to park against your own extension

Listen for feature acceptance message

Replace handset

To retrieve from another extension:

Lift up handset

Press # 4 4

Dial the extension number where the call is parked