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The National Do Not Call Registry covers intrastate telemarketing calls under the FCC’s rules. You can find information on the FCC’s regulations at fcc.gov. On the Federal Trade commission website, it says:
3. What calls are covered?
The do not call provisions of the TSR cover any plan, program or campaign to sell goods or services through interstate phone calls. This includes calls by telemarketers who solicit consumers, often on behalf of third party sellers. It also includes sellers who provide, offer to provide, or arrange to provide goods or services to consumers in return for some type of payment as part of a telemarketing transaction.
If you would like more information, you may check out the Who Must Comply with the Amended TSR? on https://www.ftc.gov/tips-advice/business-center/guidance/complying-telemarketing-sales-rule#comply.