Panasonic KX-TD816NZ User Manual

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2.5
Before Leaving Your Desk
Operation
75
2.5.3
Preventing Other People from Using Your Telephone 
(Electronic Station Lockout)
 To lock / unlock
If you forget the code or cannot unlock your phone, consult an operator. They can 
unlock your extension (Remote Station Lock Control).
Off-hook.
On-hook.
Dial 77
PT / SLT
C.Tone   
7
7
Enter code (3 digits) twice or once.
desired code
stored code
same code
OR
Lock
Unlock