Yealink CP960 User Manual page 221

To retrieve a call from another shared phone:
If there is an active call between phone A and phone C, do the following:
Long tap the desired line key on phone B.
1.
Tap CallPull.
2.
The active call has been retrieved from the phone A successfully.
If there is a held call between phone A and phone C, do the following:
Long tap the desired line key on phone B.
1.
Tap CallPull.
2.
The held call has been retrieved from the phone A successfully.
Advanced Phone Features
221