Single Button Call Parking is a feature that allows a person to put a call on hold at one telephone set and continue the conversation from any other telephone set.
Once a caller has been parked, a BLF line key on the Yealink phone will show solid red to let other users know that the park slot is occupied. Any user may retrieve the caller from the park slot by pressing the BLF line key. Most Phones will come with 1 to 2 call parking slots labeled Park 1 and Park 2.
How to use call park:
While on an active call simply press the line key labeled Park, Your phone may have more then one parking slot. The Parking slot is available if the button next to the slot is green. If the slot is Red that means there is already a call in that Parking slot. Choose the next available parking slot.
To retrieve a call from Call Park, click on the button next to the parking slot that has a Red Light.