A predictive dialer calls several numbers per agent and uses statistics to guess when an agent will be free; a power dialer calls a fixed number of lines per agent; a progressive dialer calls one number only when an agent is free; a preview dialer lets the agent see the record before calling. Predictive gives the most talk time but the most abandoned calls, progressive and preview give the fewest.
Predictive vs power vs progressive dialer: the comparison
| Dialer | Lines dialed per free agent | Abandoned calls | Best for |
|---|---|---|---|
| Preview | 1, after the agent clicks | None | Complex B2B calls, high value accounts |
| Progressive | 1, automatically | Almost none | Small teams, regulated campaigns |
| Power | Fixed ratio, often 2 to 3 | Some, depends on the ratio | Sales and collections with medium lists |
| Predictive | Variable, set by an algorithm | Most, must be capped by law in some countries | Large teams, large lists, low answer rates |
For how the predictive algorithm works and how abandon rate is measured, see what is a predictive dialer.
Predictive dialer vs auto dialer: what is the difference?
"Auto dialer" is the general term for any system that dials numbers automatically, including power, progressive and predictive dialers and also voice broadcasting systems that play recorded messages. A predictive dialer is one kind of auto dialer: it always connects answered calls to a live agent and only differs in how it decides how many numbers to dial. When people say "auto dialer" they sometimes mean a robocall system, which is regulated differently. See voice broadcasting and are auto dialers legal.
Power dialer vs predictive dialer: which one should you choose?
Choose a power dialer when the team is small (under about ten agents), when lists answer often, or when the law or your route supplier limits abandoned calls. Choose a predictive dialer when you have many agents, long lists and low answer rates, and you can keep the abandon rate under the legal limit. Predictive pacing needs a steady number of agents to be accurate, so it works poorly when agents join and leave the campaign often.
Predictive vs progressive dialer: when is progressive better?
Progressive dialing places a call only when an agent is free, so a live person is always there when the customer answers. That makes it the safe choice for regulated work such as debt collection, health or financial calls, and for markets with strict abandoned call rules. The cost is idle time: agents wait through rings, voicemail and no answers. Preview dialing adds a pause for the agent to read the record, useful when each call needs preparation.
What does each dialer mean for your VoIP routes?
The more aggressive the dialer, the more short and unanswered calls it creates, and carriers see that in the statistics:
- Channels and CPS: predictive dialing needs about 2 to 3 channels per agent and short bursts of calls per second. Progressive needs about one. See VoIP channels and CPS.
- ASR and ACD: aggressive dialing lowers ASR and ACD, which some routes penalize. See ASR, ACD and PDD and short duration calls.
- Billing: many short calls make 6/6 or 1/1 billing important.
- Caller ID reputation: high volumes from few numbers attract spam labels. See spam likely on business calls.
Always declare the dialer type to your supplier. Routes that do not accept dialer traffic are cut quickly when it shows up. Dialer traffic on VoIP routes explains what carriers ask for.
Compliance comes with every mode
Whatever the dialer, the same rules on consent, calling hours and do-not-call lists apply. In the US, the FCC caps abandoned telemarketing calls at 3% of calls answered by a person, measured over 30 days per campaign, and in the UK Ofcom uses a 3% limit over 24 hours. Rules differ by country, so check each destination before you choose a pacing mode.
Routes for dialer campaigns
VoIPMatcher sources VoIP termination from carriers that accept declared dialer traffic. Request a dialer route stating the dialer type, agents, CPS and destinations.
Frequently asked questions
Is a predictive dialer the same as a robocall?
No. A predictive dialer connects answered calls to live agents, while a robocall plays a recorded or artificial voice message. A predictive dialer can still break robocall and telemarketing rules if it abandons too many calls, plays a message without consent, or calls numbers on do-not-call lists, so it needs the same compliance care.
Which dialer has the highest agent productivity?
Predictive dialers usually keep agents talking for the largest share of each hour, because they dial several numbers per available agent and adjust the pace from live statistics. The gain shrinks on small teams and on lists with high answer rates, where a power or progressive dialer reaches similar productivity with far fewer abandoned calls.
Can a predictive dialer work with a small team?
It can, but the statistics behind predictive pacing need enough agents to be reliable. With fewer than about ten agents the dialer often has to choose between long agent idle time and many abandoned calls. Small teams usually do better with a power or progressive dialer at a fixed ratio.
What is a power dialer used for?
A power dialer is used by sales and collections teams that want faster calling than manual dialing without predictive abandonment. It dials a fixed number of lines per agent, often one to three, as soon as the agent is free. It suits small and medium teams and campaigns where every answered call should reach a person.
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