Every outbound dialer offers some mix of predictive, progressive and preview modes. They all place calls for your agents, but they make very different trade-offs between talk time, abandoned calls and how prepared the agent is when someone answers. Picking the wrong mode is one of the most common reasons a campaign underperforms.
Preview dialing: the agent decides when to call
In preview mode the agent sees the lead's record first — notes, previous calls, account value — and clicks to dial when ready. Nothing is dialed until a person is waiting.
- Best for: high-value B2B calls, account management, collections with complex histories, callbacks.
- Strength: zero abandoned calls and a well-prepared agent on every conversation.
- Weakness: the slowest mode. Agents also listen to every ring, voicemail and disconnected number themselves.
Progressive dialing: one line per free agent
Progressive (sometimes called power) dialing calls the next number automatically the moment an agent becomes available — one call per agent at a time. The agent skips the manual click, but the system never dials ahead of capacity.
- Best for: small and mid-size teams, warm leads, campaigns where every answered call must reach a live agent.
- Strength: no abandoned calls and far less idle time than preview.
- Weakness: agents still wait through ringing and unanswered calls.
Predictive dialing: dial ahead of your agents
A predictive dialer uses live statistics — answer rate, average talk time, how many agents are about to finish a call — to dial more lines than there are free agents. Unanswered calls, busy signals and voicemail are filtered out, so agents mostly hear live people.
- Best for: large lists, lower answer rates, teams of roughly 10+ agents where the statistics have enough data to work with.
- Strength: the highest talk time per agent hour — often several times more than preview.
- Weakness: if the dialer over-predicts, a person answers and no agent is free. That is an abandoned call, and it is regulated in many countries.
A quick comparison
| Preview | Progressive | Predictive | |
|---|---|---|---|
| Calls per free agent | 1, after the agent clicks | 1, automatically | More than 1 |
| Agent idle time | High | Medium | Low |
| Abandoned calls | None | None | Possible — must be controlled |
| Agent prep time | Plenty | A few seconds | Very little |
How to choose for each campaign
- Look at the value of one conversation. If a single call can be worth a large sale or a sensitive negotiation, preview first.
- Check your answer rate. If most numbers pick up, progressive is fast enough. If only 10–20% answer, predictive pays off.
- Count your agents per campaign. Predictive needs volume to forecast well.
- Know your abandon limit. If you call consumers in a regulated market, set the dialer's abandon target below the legal maximum and monitor it daily.
Many teams run more than one mode: predictive for fresh lead lists, progressive for follow-ups and preview for callbacks and VIP accounts. On ReachMeLine you can switch the mode per campaign, so you can test the difference on your own data instead of guessing.
