Panasonic DBS 40 Operating Manual page 282

Section 700 - Operation
Considerations
DBS-70-700
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FF3 (Extensions): Extension Lockout Code
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A locked extension can be used for intercom Calls.
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Station Lockout key codes can only be set from an attendant phone or a
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key phone.
You cannot confirm Speed Dialing or set Speed Dialing while Station
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Lockout is activated.
If you enter an incorrect key code and then try to dial, the phone will issue
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a busy tone.
If station lockout is set, when ON/OFF is pressed, stutter dial tone is heard
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followed by steady dial tone.
DBS Manual - Issued 8/l/95
Chapter 6. SLT Features
6-34