NEC DS1000 - Manual (Page 109)

3. Enter your current PIN number + .
At a 22- or 34-Button Display Telephone, you see:
At a Super Display Telephone, you see:
4. Enter the number of the extension you want to unlock +
HOLD .
At a 22- or 34-Button Display Telephone, you see:
At a Super Display Telephone, you see:
Extension Locking
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