What is an auto dialer, and can B2B sales teams use one legally?

An auto dialer for sales is software that places calls for reps, so they spend their time in conversations instead of typing numbers. B2B teams can often use one legally in the US when a rep is on every answered call, but the rules depend on the dialing mode, the numbers you call, and the states they are in. As of October 2026, here is how the main rules apply.

The 5 types of auto dialer

“Auto dialer” covers several modes. They differ in how many calls run at once and in who, or what, speaks when someone answers.

Type	How it dials	Who is on an answered call	Main rule to watch
Preview	Shows the contact; the rep starts the call	The rep	Calling hours and do-not-call lists
Power (progressive)	Dials the next number when the rep finishes the last call, 1 line per rep	The rep	Calling hours and do-not-call lists
Parallel	Dials several numbers per rep at once and connects the first person who answers	The rep, or nobody if the rep is busy	Abandoned calls
Predictive	Paces calls across a team from expected answer rates	The next free rep, or nobody	Abandoned calls
Prerecorded or AI voice	Plays a message or an AI voice when the call connects	A recording or an AI voice	Consent for artificial or prerecorded voices

For how lines per rep change connects and abandoned calls, see what a parallel dialer is. For how dialers tell a person from a voicemail, see answering machine detection.

What Facebook v. Duguid changed

The Telephone Consumer Protection Act (TCPA) restricts calls made with an “automatic telephone dialing system” (ATDS). The statute defines it as equipment with the capacity to store or produce numbers to be called using a random or sequential number generator, and to dial them.

For years, courts disagreed on whether any system that stores a list and dials it automatically counts. On 1 Apr 2021, the Supreme Court settled the federal question in Facebook v. Duguid: “a necessary feature of an autodialer” is the capacity to use a random or sequential number generator to store or produce the numbers. The Court said a broader reading “would capture virtually all modern cell phones”. The FCC’s rule uses the same definition (47 CFR 64.1200(f)(2)).

Duguid answered one question only. Whether a specific dialer meets the definition is a question for your counsel, and the opinion itself leaves 3 sets of rules untouched.

The rules Duguid did not change

Artificial and prerecorded voices. The Court said its decision “does not affect” the separate ban on calls using an artificial or prerecorded voice, which applies whatever technology dials the call. Under the FCC’s rule, a telemarketing call using an autodialer or an artificial or prerecorded voice to a mobile number, or using an artificial or prerecorded voice to a residential line, needs prior express written consent: a signed written agreement that names the number. Since FCC 24-17 (released 8 Feb 2024), the FCC treats AI-generated voices as artificial voices, so AI sales calls need that consent too. See our guide to AI voice agent consent rules.

Abandoned calls. The FCC’s rule caps abandoned telemarketing calls at 3% of calls answered by a person, measured over 30 days for a single campaign. A call is abandoned if no live sales representative is connected within 2 seconds of the person’s completed greeting. When no rep is free, the caller must play a short message with the business name, a callback number, and an automated opt-out within those 2 seconds. Unanswered calls must ring for at least 15 seconds or 4 rings. These limits come from 47 CFR 64.1200(a)(6) and (a)(7), not from the ATDS definition, so they matter most for parallel and predictive dialers.

Multi-line businesses. The statute separately bars using an autodialer so that 2 or more lines of a multi-line business are engaged at the same time (47 U.S.C. 227(b)(1)(D)).

Consent rules are also moving. On 1 Oct 2026 the FCC released FCC 26-67, which changes how people can revoke consent to autodialed and prerecorded calls. Its amendments take effect 30 days after publication in the Federal Register.

Mobile numbers, office lines, and state laws

The federal rules treat number types differently:

• Mobile numbers. Calls using an autodialer or an artificial or prerecorded voice need prior express consent, and prior express written consent for telemarketing. Check which of your B2B direct dials are mobiles.
• Residential lines. The federal consent rule covers calls using an artificial or prerecorded voice.
• Office lines. The consent rule does not list ordinary business lines, but the multi-line business rule and the abandoned-call limits for telemarketing still matter.

Some states use a broader test than Duguid. Florida bars unsolicited telephonic sales calls that involve “an automated system for the selection and dialing of telephone numbers” without prior express written consent. Maryland and Oklahoma use “selection or dialing”. Their scope differs: Florida’s rule covers sales of consumer goods or services, Maryland exempts business-to-business sales by a solicitor that has operated for at least 3 years under the same name, and Oklahoma’s B2B exemption is narrower. For their calling hours, see state telemarketing calling hours.

Other countries write their own definitions. Canada, for example, defines a predictive dialing device as any system that automatically starts calls from a pre-determined list; see Canada’s telemarketing rules.

What B2B teams do in practice

1. Keep a rep on every answered call. Use preview, power, or parallel modes for cold calls, and no prerecorded or AI-voice messages to people who have not given written consent.
2. Know your numbers. Tag mobiles, office lines, and the state for each contact, and ask your counsel which consent rule applies in Florida, Maryland, and Oklahoma.
3. Measure abandoned calls per campaign, and cut lines per rep before the rate nears 3%.
4. Play the required message when no rep is free, with an opt-out that adds the number to your do-not-call list.
5. Treat a prerecorded voicemail drop as a prerecorded message until your counsel says otherwise.
6. Write down your setup: the dialing modes you use, how many lines per rep, and the consent you hold for any recorded or AI-voice calls.

How DialSavvy handles this

DialSavvy’s dialer runs power dialing (1 line, with auto-advance after each wrap-up) and parallel dialing: 2 lines solo, 3 with a team of 3 or more. In parallel mode, the abandonment governor drops to 2 lines from 2.5% abandoned calls and to 1 line from 2.8%. AI answer detection labels each answer as a person, voicemail, a phone menu, or a call screener. Compliance checks run before every call: calling hours in the contact’s time zone and your do-not-call list. DialSavvy Agents, our AI voice agents, are in early access, and AI-voice consent checks are coming. See the DialSavvy dialer and DialSavvy compliance.

Before you switch on any auto dialer, list your number types and states, decide which modes each list may use, and review the setup with your counsel.