KX-T2373MXW4.4.Dial LockYou can prevent others from making a call to any number except the one pre-programmed in the memory of the EMERGENCYbutton. Once you locked the dialing buttons, even emergency numbers cannot be dialed. Only incoming calls are accepted untilthe dial lock is canceled.Before using this feature, we recommend storing an emergency number in the memory of the EMERGENCY button. Even if thedialing buttons are locked, the number stored in the button can be dialed.· If you choose not to program emergency numbers, but plan to use the dial lock, any number programmed into the EMERGENCY button can be accessed .4.4.1.To Set the Dial Lock You can use the following features while the dialing buttons are locked.· Dialing a number you programmed into the memory of the EMERGENCY button.· Adjusting the handset and speakerphone volumes.· Muting the conversation.· Answering the second call by pressing