Do not call list compliance: scrubbing, suppression and dialer hygiene

Do not call list compliance comes down to one habit: before any marketing call goes out, check that the number is allowed to receive it, and keep proof that you checked. Registries, your own suppression file and calling-hour limits are all part of the same routine. That matters more, not less, when an AI agent can dial hundreds of numbers in an afternoon.

This is general information, not legal advice. Rules differ by country and state and change over time, so check current requirements for each region you call.

The lists you need to think about

Four different lists get confused with each other. Keeping them separate makes the process clearer.

List	What it is	Who owns it
National registry	Government or regulator-run register, such as the US National Do Not Call Registry or the UK TPS and CTPS	Regulator
State or regional lists	Extra state-level registers in some US states, and national lists in other EU countries	State or country
Internal suppression list	Your own numbers that must never be called again	You
Consent list	People who have actively agreed to be contacted	You

A consent record can override a registry in some places, for example when someone gives written permission to a specific seller, but only if it is genuine, recent and specific. Do not use it as a loophole for old or vague permissions. For consent rules by region, see is AI cold calling legal, TCPA and AI voice calls and PECR and AI calls in the UK.

Build the suppression file first

Your internal suppression list is the most important list because it is the one nobody else maintains. A good one:

• Contains the phone number in a normalised format, such as E.164 (+14155550123), so that formatting differences do not hide duplicates.
• Records the date, source and reason for each entry: opt-out on a call, written request, complaint, wrong number.
• Is global across campaigns, agents, phone numbers and any tools that dial, including a human team's dialler.
• Is checked automatically at upload, not by hand.

Treat "wrong number" and "deceased" outcomes as suppression events too. They are rarely a legal requirement but they protect your reputation and your answer rates.

A scrubbing routine that works

For each campaign, run the same steps in the same order.

1. Clean the file. Normalise numbers, remove duplicates, drop obviously invalid ones. The lead list preparation checklist covers formatting in detail.
2. Check consent. Confirm each contact has a documented reason to be called. Remove anyone who does not.
3. Remove suppression matches. Compare against your own suppression list first.
4. Screen against registries. Use the relevant national and state registers for each region in the list, and keep the date.
5. Respect timezones. Add timezone to each contact so you can restrict calls to permitted hours locally.
6. Archive the final file with the date, the registry versions used and the person who ran the check.
7. Launch. Only then upload to the dialling platform.

How fresh does the scrub need to be?

Registries publish new data on a schedule, and some rules specify a maximum age for the scrub. In the US, the commonly cited standard is that a business must use a version of the registry that is no more than 31 days old. In the UK, the TPS data refreshes regularly and screening immediately before a campaign is the safest habit. If your campaign runs for weeks, rescrub partway through. Do not assume a list that was fine in March is fine in June.

Calling hours and retries

Hours restrictions sit alongside list restrictions, and they are easy to automate once you set them properly.

• Set campaign hours in the recipient's local time. If the list spans multiple timezones, use a timezone field on each contact.
• Keep to the strictest rule that applies. In the US, federal rules generally permit telemarketing calls from 8am to 9pm local time, and some states are tighter, including on certain days.
• Do not retry endlessly. A cap on attempts per contact is both a compliance control and a courtesy.

Purple Voice campaigns have calling hours, up to five retries and separate retry hours, and a progress bar plus not-reached analytics so you can see who has been attempted. For cadence ideas, see best time to call leads and lead follow-up cadence. The hours are a control you set, so the compliance of those hours is on your list and your region, not the tool.

Handling opt-outs during a call

An AI agent has to deal with "take me off your list" in real time. Put this explicitly in the prompt:

If the person asks not to be called again, apologise briefly, confirm that you will remove their number, end the call, and mark the outcome as "do not call".

Then make sure your process closes the loop:

1. The agent marks the call outcome.
2. The number is added to the suppression list within hours, not weeks.
3. The list is applied to every active and future campaign.

Check transcripts for phrases such as "stop calling", "remove me", "don't call again" and "this is a wrong number". Those phrases should always lead to a suppression entry. A webhook or automation can add the number to your list automatically, a topic covered in AI voice agent API and webhooks.

Proving you did it

If a complaint or a claim arrives, the question will be "what did you check, and when?" Keep:

• The final dialled list, with the date it was scrubbed.
• Evidence of the registry version or screening service used.
• Your suppression list and its change history.
• Call logs, recordings and transcripts, subject to your retention policy (see GDPR and call recording).
• Written procedures and the name of who is accountable.

It is dull paperwork, and it is the thing that separates a defensible incident from an expensive one.

Common mistakes

• Scrubbing once at list purchase, then dialling for months.
• Keeping a separate suppression file for each campaign.
• Normalising numbers inconsistently, so +44 7700 900123 and 07700 900123 are treated as different people.
• Treating a business number as exempt without checking whether it is a mobile or belongs to a sole trader.
• Leaving a retry setting at its maximum on a low-intent list.

Try it

If you want to test your own routine, start with a small consented list on the Free plan: 1 agent, 1 number, 100 contacts, no card. Set conservative calling hours, make a few calls to your own phone first, and see how the suppression process fits in. Start at voice.purplerocket.co.