A predictive dialer is software that calls several phone numbers at the same time for each agent and uses an algorithm to guess when an agent will be free. When someone answers, the call is sent to the next available agent. The goal is simple: keep agents talking and cut the time they spend listening to rings, busy signals and voicemail. This guide explains how it works, where it shines, where it causes trouble, and the abandoned call rules you must follow in the United States and Canada.
How a predictive dialer works
- It watches the numbers. The dialer tracks how often calls are answered, how long conversations last and how long agents need to wrap up after each call.
- It predicts when agents will be free. From those numbers, the pacing algorithm estimates when each agent will finish the current call.
- It dials ahead, several lines per agent. If only one call in four is answered, the dialer may place three or four calls for every agent who is about to be free. This is the "dial ratio".
- It filters what is not a person. No answers, busy signals, disconnected numbers and, with answering machine detection, most voicemail greetings are dropped before they reach an agent.
- It connects the live answer. When a person picks up, the call goes to the first free agent, usually with the contact's record on screen at the same moment.
The catch sits in step 3. When more people answer than the algorithm expected, there is no agent free for some of them. Those calls are "abandoned": the person says hello and hears silence or a recorded message. That is why abandoned calls are regulated.
Pros and cons
| Topic | Advantages | Drawbacks |
|---|---|---|
| Talk time | Agents spend far more of each hour in conversation than with manual dialing. | Agents get little or no time to read the contact's file before the conversation starts. |
| Volume | Built for very large lists and long calling campaigns. | The algorithm needs enough agents and data to predict well; with a small team, predictions swing and drops go up. |
| Experience for the person called | Agents rarely wait between calls. | A short delay or silence after "hello" is common, and many people hang up right away. |
| Compliance | Good systems track the abandoned call rate for you. | Abandoned call caps, recorded message rules and record keeping apply in the US and Canada. |
| Number reputation | None in particular. | Many short or silent calls hurt your number's reputation and can lead to "Scam Likely" labels. |
The abandoned call rules in the US and Canada
United States
The FTC's Telemarketing Sales Rule (16 CFR 310.4(b)(4)) and the FCC's TCPA rules (47 CFR 64.1200(a)(7)) set the same core limits for sales calls made with a predictive dialer:
- 3% maximum. No more than 3% of the calls answered by a person may be abandoned, measured per calling campaign over a 30-day period.
- 2 seconds. A call counts as abandoned if the person is not connected to a live sales rep within 2 seconds of finishing their greeting.
- Recorded message. When a call is abandoned, a recorded message must play within those 2 seconds with the seller's name and a phone number (under the FCC rule, also a way to opt out of future calls).
- Let it ring. An unanswered call must ring for at least 15 seconds or four rings before the dialer hangs up.
- Keep records. You must be able to show your abandonment rate for each campaign.
The usual telemarketing rules also apply: the National Do Not Call Registry, your own internal do-not-call list and calling hours of 8 a.m. to 9 p.m. in the person's local time. Some states add their own rules on automated dialing, so check each state you call.
Canada
The CRTC's Unsolicited Telecommunications Rules set a different limit:
- 5% maximum, per calendar month. The abandonment rate is measured against all calls placed by the predictive dialer, not only answered calls.
- 2 seconds. A call is abandoned when no live telemarketer is available to speak within two seconds of the answer.
- Records for 3 years. Telemarketers and their clients must keep monthly abandonment rate records for three years.
- Calling hours. 9 a.m. to 9:30 p.m. on weekdays and 10 a.m. to 6 p.m. on weekends, in the time zone of the person called, plus the National Do Not Call List.
Sources: FTC Telemarketing Sales Rule, FCC TCPA rules and CRTC Unsolicited Telecommunications Rules, as of October 2026. This page is general information, not legal advice. Provinces and states can add stricter rules.
Abandoned call budget calculator
Use this to see how many abandoned calls a campaign can afford before it breaks the US 3% rule. Enter the calls you expect people to answer over 30 days.
Example: a campaign with 2,000 answered calls in 30 days can abandon at most 60 of them. In Canada, the 5% cap is calculated on all calls placed in the calendar month instead.
Predictive, power, progressive and preview dialers
- Predictive dialer: several calls at once per agent, paced by an algorithm. Highest volume, highest risk of abandoned calls.
- Power dialer: dials the next number for a rep as soon as the last call ends. Every answered call reaches a live rep, so there are no abandoned calls by design.
- Progressive dialer: dials one number per agent only when that agent is free. Often used as another name for a power dialer.
- Preview dialer: shows the contact's file first and dials when the rep clicks. Slowest, but the most prepared.
For a detailed side by side, read power dialer vs auto dialer vs predictive dialer.
Who should use a predictive dialer?
A predictive dialer makes sense for large call centers with many agents on shift at the same time, very large lists, short and similar calls, and a team that can monitor abandonment rates every day. Collections, surveys and high-volume consumer campaigns with consented lists are the classic cases.
It is usually the wrong tool for a team of 2 to 10 people. With few agents, the algorithm cannot predict reliably, dropped calls climb, and each burned lead costs more because your list is smaller. Small teams that sell to leads, past customers and referrals get more from a power dialer: fewer calls per hour on paper, but every person who answers hears a real rep from the first second.
Frequently asked questions
Is a predictive dialer legal?
Yes, in the US and Canada, as long as you respect the abandoned call limits, recorded message rules, calling hours and do-not-call lists described above. Prerecorded marketing messages and calls to cell phones can need prior consent, so check the rules for each campaign.
What is a good dial ratio?
There is no fixed number. The algorithm adjusts it to your answer rate and call length. A higher ratio means more talk time but more abandoned calls, so the right ratio is the highest one that keeps you under the legal cap.
Why do people hear silence when a predictive dialer calls?
Because the call was answered before an agent was free, or answering machine detection was still listening. That silence is exactly what the 2-second rule targets.
Is a predictive dialer the same as a robocall?
No. A robocall plays a recorded message. A predictive dialer connects the person to a live agent; it only plays a recorded message when a call is abandoned.
A dialer that never leaves people on hold
Zorino is a power dialer for teams of 2 to 10. It calls your list one number at a time for each rep, skips answering machines and rings the rep's own phone only when a real person answers, so nobody hears silence. Callbacks, notes and your Do Not Call list stay in the client file. Try the live demo: it rings your own phone in 2 minutes, no account and no card.