What Is a DNC Scrub?

Voz360 editorial / Updated 2026

What gets checked in a DNC scrub

A complete DNC scrub typically checks a calling list against two categories of suppression data: the applicable national Do-Not-Call registry (which restricts marketing calls to numbers registered by consumers who opted out), and the organization’s own internal, tenant-level do-not-call list (numbers that asked that specific business to stop calling, regardless of national registry status). Both checks matter — a number can be absent from the national registry while still being on a business’s own suppression list, and a business is generally expected to honor both.

When the scrub should happen: before the list is loaded, and again before dial

A DNC scrub run once when a calling list is first uploaded is a reasonable first pass, but registries and internal suppression lists change continuously — a number can be added to a do-not-call list after a campaign list was built but before every number on it has been called. A more defensible design checks DNC status again at the moment of dial, not just at list-load time, so a campaign that runs over several days does not keep calling a number that opted out on day two.

Why an internal (tenant-level) list matters as much as the national registry

The national registry addresses consumer-initiated opt-outs at a broad level; it does not capture a customer telling one specific business directly, "stop calling me," which many regulatory frameworks treat as a binding request independent of national registry status. A DNC scrub that checks only the national registry and ignores the organization’s own suppression history is incomplete.

How Voz360 approaches DNC scrubbing

Voz360’s Compliance Engine checks every outbound number against both the tenant’s own do-not-call list and the applicable national registry before a call places, as part of the same gate sequence that also runs TCPA consent matching and allowed-hours evaluation — across all six dialer modes, not just the highest-volume ones. This does not replace an organization’s obligation to maintain accurate suppression data or confirm which registries apply to a given campaign and jurisdiction.

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Questions, answered

What enterprise buying teams want to know.

Self-contained answers, so the questions a security or procurement reviewer asks first don't require reading the whole page.

Is checking the national Do-Not-Call registry enough on its own?

Generally not considered sufficient on its own. Many regulatory frameworks also require honoring a business’s own internal do-not-call list — a customer who asks one specific company to stop calling has typically made a binding request independent of whether their number is on the national registry.

How often should a DNC scrub run during a multi-day campaign?

A scrub at list-load time is a minimum; because suppression lists and registries change continuously, checking DNC status again at the moment of dial — not just when the list was first built — is a stronger design for campaigns that run over multiple days.

Does Voz360’s DNC scrub check both national and internal lists?

Yes. Voz360’s Compliance Engine checks outbound numbers against both the tenant’s own internal do-not-call list and the applicable national registry before a call places, as part of its outbound gate sequence.

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