Predictive vs Progressive vs Preview Dialer

A predictive dialer calls several numbers per agent and connects answered calls as agents become free; a progressive dialer calls one number only when an agent is free; a preview dialer shows the agent the customer record before the agent starts the call. Predictive gives the most talk time, progressive avoids keeping customers waiting, and preview gives the most control.

Published 4 November 2026 · 3G Callnet

The four dialing modes

Mode	How it dials	Agent waits?	Customer waits?	Best for
Predictive	Several numbers per agent, timed by an algorithm that predicts when agents will be free	Least	Sometimes	Large B2C lists, short calls
Power	A fixed number of lines per agent	Little	Sometimes	Mid-size lists
Progressive	One number, only when an agent is free	Some	No	Small teams, quality-sensitive calls
Preview	Agent reviews the record, then dials	Most	No	B2B, collections, complex calls

How to choose

List size and contact rate. Big lists with low answer rates benefit most from predictive dialing.
Call value and complexity. High-value or complex calls suit preview dialing.
Customer experience. If a customer must never hear silence after answering, use progressive or preview.
Team size. Predictive dialing works best with enough agents (typically 10 or more) for the prediction to be accurate.
Use more than one mode. Most modern dialers let you set the mode per campaign.

Compliance in India

Outbound telemarketing must follow TRAI’s commercial communication regulations: respect the customer’s DND preferences, call through registered channels and keep abandoned calls to a minimum.

Frequently asked questions

Which dialer gives the most agent talk time?

A predictive dialer, because it dials several numbers per agent and only passes answered calls, removing ringing, busy and no-answer time from the agent's day.

What is the downside of predictive dialing?

If more people answer than there are free agents, some calls are dropped or kept waiting (abandoned calls). The dialing ratio must be tuned to keep abandonment low.

When is a preview dialer better?

When each call needs preparation — B2B sales, collections, account management or complex support — because the agent sees the record before calling.

What is a power dialer?

A power dialer dials a fixed number of lines per agent (for example 2 or 3) without prediction. It sits between progressive and predictive dialing.