If the user forgot their phone’s 4 digit unlock-PIN or did not sign-out of the phone before they left, a phone reset will need to be performed:

1. unplug the phone’s LAN network cable.
2. Press and hold the * (star) and # (pound) buttons simultaneously while plugging the phone’s LAN cable back in, continue holding the star and pound button until you get a prompt asking “The operation you have requested will erase all user-created date. Do you want to continue?“
3. Select Yes.
4. The phone will take several minutes to configure itself and reboot, you will need to re-provision the phone.