The Autodialer Question — Federal Test, State Overlays, as of July 2026

What Is an ATDS? The Autodialer Definition Under the TCPA

An ATDS — automatic telephone dialing system, the TCPA’s term for an autodialer — is equipment with the capacity to store or produce telephone numbers using a random or sequential number generator. That is the definition a unanimous Supreme Court settled on in Facebook v. Duguid (2021), and it is narrower than most people expect: dialing automatically from a stored lead list, by itself, does not satisfy it in most courts’ reading. The stakes: autodialed telemarketing calls to cell phones without the right consent run $500 to $1,500 per call under 47 U.S.C. § 227(b)(3). Below: the federal test, why the answer for modern dialers stays hedged, and the state statutes that define autodialer far more broadly — as of July 2026.

This page is education, not legal advice. A dialer is a tool — compliance depends on how you use it. Whether a specific setup is an ATDS — federally or under a state statute — is a question for a TCPA attorney, not a software vendor.

The ATDS Definition and Why It Was Fought Over

The TCPA, 47 U.S.C. § 227, restricts calls made to cell phones using an automatic telephone dialing system or an artificial or prerecorded voice. Everything hangs on the definition: equipment with the capacity to store or produce telephone numbers using a random or sequential number generator.

For years, plaintiffs argued the definition swept in any system that dials automatically from a stored list — essentially every modern sales dialer. Courts split, class actions multiplied in the gap, and the Supreme Court took the question up in Facebook v. Duguid.

Facebook v. Duguid: The Random or Sequential Number Generator Test

Decided April 1, 2021, Facebook, Inc. v. Duguid, 593 U.S. 395, was unanimous: equipment is an ATDS only if it has the capacity to store or produce telephone numbers using a random or sequential number generator. The generator requirement applies either way — a device does not become an autodialer merely because it stores numbers and dials them without human input.

The practical consequence, in most courts’ post-Duguid reading: dialers working stored, human-built lead lists fall outside the federal definition. Random or sequential generation describes equipment that invents the numbers it dials, not a CSV of named prospects.

Why “Is My Dialer an ATDS?” Still Gets a Hedged Answer

It depends on the court, as of July 2026. After Duguid, most federal courts hold that dialers calling stored lead lists are not an ATDS — but the case law is unsettled: the Second Circuit has read stored-number capacity more broadly, the Supreme Court declined to adopt a “human intervention” test, and human-launched click-to-dial systems have repeatedly been found non-ATDS. Where your prospects live can change your exposure — ask a TCPA attorney before relying on any of this.

One constant across circuits: artificial and prerecorded-voice calls are restricted separately, whatever dialer places them.

What Actually Turns on the ATDS Answer

If equipment is an ATDS, the federal consent ladder changes:

• Telemarketing to cell phones using an ATDS or an artificial or prerecorded voice requires prior express written consent — a signed writing clearly authorizing those calls to that number — under 47 C.F.R. § 64.1200(a)(2).
• Informational, non-telemarketing autodialed calls to cell phones require prior express consent, which need not be written, under 47 C.F.R. § 64.1200(a)(1).
• Live, manually dialed calls need no prior consent under federal law — subject to the DNC registry, quiet hours, and the rules covered in TCPA for cold callers.

Three cautions travel with that ladder. Damages attach per call — $500 or actual loss, whichever is greater, trebled up to $1,500 for willful or knowing violations. There is no blanket B2B carve-out — a decision-maker’s personal cell counts as a wireless number regardless of use. And the artificial-voice restriction now expressly covers AI: the FCC’s unanimous February 8, 2024 declaratory ruling (FCC 24-17) holds that AI-generated and cloned voices are “artificial” voices under the TCPA, so AI-voice telemarketing needs prior express written consent however the number was dialed.

The duty-by-duty federal rulebook — consent tiers, quiet hours, identification, revocation — lives on the TCPA autodialer rules page.

State Mini-TCPAs: Where “Autodialer” Means Much More

Duguid interpreted the federal statute only. Several states have written their own autodialer triggers — and none of them contain the random-or-sequential-generator element:

Read the wording gap carefully: an “automated system for the selection or dialing of telephone numbers” plausibly describes an ordinary list-based dialer nowhere near a federal ATDS. No appellate court has authoritatively construed how far “automated system” reaches — these statutes may cover list-based dialers that are not federal autodialers, the boundary is unsettled, and it belongs in front of counsel before you dial those states.

The stakes are federal-sized. Florida and Oklahoma both carry private rights of action at $500 per violation, trebled up to $1,500 for willful or knowing conduct (Fla. Stat. § 501.059(10); 15 O.S. § 775C.6), and both statutes presume a call to their area codes reaches a resident of the state. Connecticut violations can draw a fine of up to $20,000 per violation (Conn. Gen. Stat. § 42-288a(o)). One Florida wrinkle: the “and” standard dates only to May 25, 2023 — suits over earlier conduct may proceed under the older, broader “or” standard, and courts have differed. The wider state picture — hours, frequency caps, registries, penalties — is on the state mini-TCPA laws page.

Where Enzo Fits — and What This Page Doesn’t Decide

Enzo runs power, predictive, and preview dialing in single-line and multi-line modes — the plain-English tour is on the what is a dialer page. What this page cannot tell you is how a court would classify your program: ATDS status turns on capacity, configuration, and the courtroom; the state “automated system” language turns on wording no appellate court has pinned down. The dialer itself is compliant as a tool; compliance depends on how you use it — the consent you captured and can prove, the lists you scrubbed before upload, the hours and states you dial. Enzo does not scrub lists against national or state DNC registries — run a third-party scrub first — and its internal DNC is campaign-level only, so your consent records and master suppression file stay your responsibility.

If your program’s legal theory is “our dialer is not an ATDS,” treat that as a hypothesis for counsel to stress-test in every state you call — the federal definition is narrow after Duguid, but the edges are contested and the state statutes above do not use the federal test at all.

See how Enzo’s dialing modes fit into a compliance-minded workflow — book a free discovery call.

Not legal advice. This guide is general information for outbound calling teams, not legal advice. Rules change and apply differently by state, industry, and call type — confirm your program with qualified telemarketing compliance counsel.

Definitions and rules from 47 U.S.C. § 227, 47 C.F.R. § 64.1200, Facebook, Inc. v. Duguid, 593 U.S. 395 (2021), FCC 24-17, and official Florida, Oklahoma, Maryland, and Connecticut statute texts, as of July 2026 — educational only, not legal advice.