NDNC Registry Scrubbing

Registry scrubbing is one layer of dialing eligibility. A production system also needs internal suppression, consent and contact-purpose rules, campaign controls, normalization, and an auditable decision for every attempted number.

Suppression layers

1. Normalize the number to a stable dialing format.
2. Reject invalid, unsupported, or incomplete destination numbers.
3. Check the current applicable registry or provider suppression source.
4. Check internal do-not-call and complaint lists.
5. Confirm the contact relationship, consent, and approved purpose for the campaign.
6. Apply schedule, concurrency, and campaign-level eligibility rules.
7. Record the decision and source version used for the call attempt.

Dialing eligibility result

type DialDecision =
  | { allowed: true; reasons: string[]; sourceVersion: string }
  | { allowed: false; reason: string; sourceVersion: string };

function evaluateNumber(
  number: string,
  registryResult: RegistryResult,
  internalResult: SuppressionResult,
  campaign: Campaign
): DialDecision {
  if (!registryResult.eligible) {
    return { allowed: false, reason: 'registry', sourceVersion: registryResult.version };
  }

  if (!internalResult.eligible) {
    return { allowed: false, reason: 'internal', sourceVersion: internalResult.version };
  }

  if (!campaign.isWithinCallingWindow(new Date())) {
    return { allowed: false, reason: 'calling_window', sourceVersion: 'current' };
  }

  return {
    allowed: true,
    reasons: ['registry_clear', 'internal_clear', 'window_valid'],
    sourceVersion: registryResult.version
  };
}

Operational controls

Failure policy

If a required eligibility source is unavailable or stale beyond the approved threshold, default to not dialing and alert the compliance owner. Avoid silently treating unknown eligibility as permission.