Panasonic KX-TDA15 Features Manual page 292

1.24 Extension Controlling Features
3.8.17 [2-9] System Options—Option 1—PT LCD—Password / PIN Display
3.10.1 [4-1-1] Wired Extension—Extension Settings—Option 2—Extension PIN
3.10.10 [4-2-1] Portable Station—Extension Settings—Option 2—Extension PIN
PT Programming Manual
[005] Extension Personal Identification Number (PIN)
User Manual References
3.1.2 Settings on the Programming Mode
3.2.2 Manager Programming
292 Feature Guide