Definition
In the US, the National Do Not Call Registry is run by the Federal Trade Commission and lets consumers opt out of most telemarketing calls. Businesses that call consumers must check their lists against it. Calls to businesses are mostly outside the registry's rules, but any person who asks not to be called again should be added to the caller's own internal do-not-call list. This is a general description, not legal advice.
How It Works
Before a calling campaign to consumers, the list is checked ('scrubbed') against the national registry and any state lists, and matching numbers are removed. During the campaign, anyone who asks not to be called again is added to an internal do-not-call list straight away.
Consumer calls should also stay within the permitted calling hours in the recipient's local time. Keep the internal list in one place that every caller checks, and record the date of each request.
When an outside calling team makes calls for you, agree in writing who keeps the list and how quickly new requests are added, because the business selling the product remains responsible for it..