Do Not Call (DNC) refers to lists of people who have asked not to be contacted, including the national registry and your own internal opt-outs. Honoring DNC is a legal requirement, so a compliant dialer scrubs numbers against these lists before anyone dials.
There is a national DNC registry plus the internal suppression list every business must keep for people who opt out directly. Calling a suppressed number is a compliance violation.
Dialfyne keeps a per-client DNC list and hard-blocks suppressed numbers before a call is placed, and dispositions that signal an opt-out add the number to DNC automatically.
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