NEC DS1000 - Manual (Page 107)

At a Super Display Telephone, you see:
4. Enter your new PIN number + .
At a 22- or 34-Button Display Telephone, you see:
At a Super Display Telephone, you see:
5. To confirm your entry, reenter the PIN number you just
entered in step 4 above +
HOLD .
At a 22- or 34-Button Display Telephone, you see:
Extension Locking
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