If your main system cabinet (in some closet somewhere) is plastic, you have the NEC Electra Professional Level I system and the DND cancel procedure is <FNC>, 60, <FNC> when the phone is idle. If your main system cabinet is metal, you have the NEC Electra Professional Level II system and the DND cancel procedure is <FNC>, 69, <FNC> when the phone is idle. You can also press "42" while hearing intercom dial tone. The most common cause of accidentally setting DND is by dialing "40" while hearing intercom dial tone (Level II system).There is a slim chance your main system is not the Electra Professional series. If either of the above do not work, let me know.
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