What is an Automatic Call Distributor (ACD)?
Last Updated September 28, 2026
An automatic call distributor, or ACD, is contact center technology that receives inbound interactions and routes them to the appropriate queue, agent or automated resource. ACD systems are foundational to call center operations because they coordinate demand with available employees and generate important queue and routing data.
How an ACD works
- An inbound interaction enters the contact center.
- The system identifies available routing context such as number dialed, customer input or detected intent.
- Routing rules determine the eligible queue or skill group.
- The interaction waits if no qualified resource is available.
- The ACD delivers the interaction to an eligible agent.
- Queue, routing and handling events are recorded for reporting.
Common ACD routing methods
- Longest-idle agent.
- Skills-based routing.
- Priority routing.
- Language-based routing.
- Customer-segment routing.
- Intent-based routing.
- Predictive or AI-assisted routing.
What does an ACD measure?
Important ACD metrics
- Average speed of answer.
- Service level.
- Abandonment.
- Queue depth.
- Longest wait.
- Contacts handled.
- Transfer rate.
- Agent availability and states.
- Routing outcome.
ACD vs. IVR
The ACD is primarily responsible for routing and queue distribution, while IVR interacts with callers through menus, speech or self-service. The two often work together: IVR can collect intent or authentication information that the ACD then uses for routing.
Intelligent routing and AI
Modern contact center platforms can combine ACD logic with AI-based intent detection, customer context and historical outcomes. The goal is to make a better match between the customer need and the available resource.
Routing should still be monitored for fairness, accuracy and actual resolution performance.
Preserve existing ACD authority
This page should remain primarily focused on the definition, operation and measurement capabilities of an ACD. The long-form query about what ACD systems do not measure is addressed as a supporting question rather than replacing the page's core topic.
That protects relevance for broader ACD terms while expanding coverage around measurement questions.
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