ACD — Automatic Call Distributor

An Automatic Call Distributor (ACD) is a telephony system that receives inbound calls and distributes them to agents or extensions according to routing logic. Rather than ringing all agents simultaneously or routing randomly, an ACD applies rules to match each call with the best available resource — based on factors like agent skill, call priority, time in queue, or customer history.

Common ACD routing strategies include: round-robin (calls distributed evenly across agents), least-occupied (routes to the agent with the fewest active or recent calls), skill-based routing (matches caller needs to agent expertise), and priority routing (high-value callers reach agents faster). ACDs are foundational to call center operations but are equally useful for any business that needs structured inbound call handling.

In cloud VoIP platforms, ACD functionality is built into the call queue and ring group configuration. Zonitel's active panel gives supervisors real-time visibility into how calls are being distributed — who is on a call, who is available, how long callers have been waiting — and allows routing rules to be adjusted instantly without downtime.