Do Not Call registries record numbers that have opted out of telemarketing calls. There is a national US registry, state registries, and the internal list a company must maintain of people who asked it directly to stop calling.
The internal list is the one most often neglected and the easiest to be caught on: a request to stop applies to the company that received it, and it must survive changes of tooling, list vendor and CRM. A migration that loses internal DNC records recreates every violation it previously stopped.
Scrubbing against registries is a pre-dial step, not a periodic one, because a list assembled a month ago has aged against a registry that changes daily.
This is a plain-English summary, not legal advice, and B2B calling sits differently to consumer calling in ways that depend on your specific facts.
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