---
title: Concurrency
description: Understand account channels, campaign caps, and safe call throughput.
---

Concurrency is the number of calls that may be active at the same time. One channel supports one live call; three channels can support up to three simultaneous calls when provider and campaign limits also permit it.

The effective limit is the smallest applicable constraint:

`plan channels → provider/system availability → campaign max concurrency → eligible contacts`

Increasing campaign concurrency cannot exceed account or provider capacity. Multiple active campaigns may share available channels.

## Plan safely

Start with one channel, confirm call quality and outcome accuracy, then increase gradually. Monitor provider errors, answer rate, webhook processing, follow-up queues, and human-team capacity.

Number rotation distributes outbound work but does not itself create more channels. Retries and no-answer cooldowns also affect throughput.