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If you have a DTP-16D phone, I believe that device was used primarily on the NEAX 2000 system by NEC. If that is true, you can try the default DND cancel code: #8 (*8 sets it). Unfortunately, the system codes CAN be changed by the installer, so it could be something else. Please let us know if that works. Thanks.
Have a coworker call your extension to see if DND is on, they will go straight to voicemail or get a fast busy. Speaker 42 may be the default cancel DND code, depending on your system and whether the codes were changed. Anyway, ringing is set up in system programming. If someone calls your extension it will likely ring, but outside calls have to be assigned to ring in system programming. Usually need a tech to do the programming since it gets complicated very quickly.
I loosely followed Solution #2's answer. If you pick up the phone, the display screen will show options above each of the 4 'arrow' buttons. The one to the far right, for me anyway, showed something looking like this: >>>
I hit it and it showed a number of options, one being "DND". Hitting that deactivated (or activated) DND on the phone I was currently on. That solved the problem for me.