Predictive Dialer
A predictive dialer is an automated outbound calling system that dials multiple telephone numbers simultaneously, using algorithms to predict when agents will become available and connecting answered calls to the next free agent. Predictive dialers maximize agent productivity in outbound contact center operations by eliminating manual dialing, busy signals, voicemails, and no-answers from the agent's workflow.
In workforce management contexts, predictive dialers effectively control outbound demand — unlike inbound operations where demand arrives unpredictably, outbound volume is generated by the dialer at rates the WFM team and operations can configure. This inverts the traditional WFM planning challenge.
How Predictive Dialing Works
The dialer algorithm:
- Monitors the number of agents currently on calls and their expected completion times
- Predicts when agents will become available based on historical AHT patterns
- Initiates multiple outbound calls before agents finish their current interactions
- Routes answered calls to the next available agent
- Dispositions unanswered attempts (busy, no answer, voicemail, disconnected)
The pacing algorithm balances two competing objectives:
- Agent productivity: Minimize idle time between connected calls (maximize occupancy)
- Compliance: Minimize "abandoned" calls where the dialer connects a live person but no agent is available (regulated by FTC, Ofcom, and other bodies)
Dialer Types
| Type | Mechanism | Agent Productivity | Compliance Risk | Best For |
|---|---|---|---|---|
| Preview | Agent sees contact info, decides to call | Low (agent controls pace) | None | High-value or complex outbound |
| Progressive | System auto-dials one number per available agent | Moderate | Minimal | Moderate-volume outbound |
| Predictive | System dials multiple numbers per agent using prediction algorithm | High (30-40 min/hr talk time) | Higher (must manage abandon rate) | High-volume campaigns |
| Power | Dials fixed ratio of numbers per agent (e.g., 3:1) | Moderate-high | Moderate | Campaigns with known contact rates |
Regulatory Constraints
Predictive dialing is subject to strict regulation because it can generate "nuisance calls" (connections with no agent available):
| Regulation | Jurisdiction | Key Requirement |
|---|---|---|
| Telephone Consumer Protection Act (TCPA) | United States | Prior express consent for automated/prerecorded calls to mobile; strict calling hours |
| FTC Telemarketing Sales Rule | United States | Maximum 3% abandoned call rate measured over 30-day campaign |
| Ofcom regulations | United Kingdom | Maximum 3% abandoned call rate; minimum 2 seconds of silence before disconnect |
| GDPR | European Union | Consent requirements for outbound contact; right to object |
| Do Not Call registries | Multiple | Prohibition on calling registered numbers |
| Calling windows | Multiple | Typically restricted to 8am-9pm local time |
These regulations directly constrain WFM: abandon rate caps limit dialer aggressiveness (pacing ratio), calling windows restrict available scheduling hours, and consent requirements reduce contactable list size.
WFM for Outbound Operations
Staffing Calculations
Outbound staffing differs from Erlang C-based inbound staffing:
Where connects per agent per hour depends on:
- Contact rate (% of dials reaching a live person)
- Average talk time per connected call
- After-call work time
- Dialer pacing efficiency
Blended Scheduling
Most modern centers blend inbound and outbound work. The dialer throttles outbound calling when inbound demand rises:
- Inbound priority: Agents shift to inbound when service level drops below threshold
- Outbound fill: Agents make outbound calls during low inbound intervals
- Dynamic blending: Real-time switching based on queue conditions
This blending improves occupancy across the day but creates complex scheduling challenges.
See Also
- Workforce Management — Overview of the WFM discipline
- Telemarketing — Outbound contact center operations
- Contact Center — Operational environment
- Automatic Call Distributor — Inbound counterpart to the outbound dialer
- Multi-Channel and Blended Operations — Blended inbound/outbound management
- Occupancy — Improved through outbound blending
- Employee Scheduling — Scheduling for outbound campaigns
