Maximum Adapt Dial Level: capping predictive aggressiveness

In predictive mode VICIdial decides on its own how many lines to open per agent, and on a campaign with great contact rates it will happily push that number up. Maximum Adapt Dial Level is the hard ceiling on that ambition. No matter how confident the algorithm gets, it will never open more lines per agent than this number. Think of it as the speed limit sign the dialer is not allowed to drive past.

What the number represents

The value is lines per agent. A setting of 3.0 means that at full tilt the dialer may open three lines for every counted agent. It must be a positive number greater than one, and it accepts decimals, so 2.5 or 4.0 are both fine. The default is 3.0. This is the upper bound on dialer pacing under any adaptive dialing method, and it is ignored entirely in MANUAL and RATIO modes where the pace is fixed by you instead.

An important detail: the cap can sit higher than your Auto Dial Level. The starting auto dial level is where the dialer begins, while this field is how far it is allowed to climb. So a campaign might start at 2.0 and be permitted to ride up to 4.0 when leads are answering well, then settle back down when they are not.

How to size it

Two things bound your real ceiling: how many agents you have and how many channels your trunk can carry. Picture six agents dialing across a circuit with twenty-four channels. Six agents at a cap of 4.0 is twenty-four simultaneous lines, which fits the circuit exactly. Push the cap higher than your channels can carry and you do not dial faster, you just generate busy signals and wasted attempts. Push it lower than your hardware allows and you leave throughput on the table.

The cap does not, on its own, raise your drop rate. It only sets the maximum. The predictive algorithm still steers below it, governed by your Drop Percentage Limit. A generous cap simply gives the dialer more room to use on good lists. For the full picture of how these settings interact, the ties them all together.

When the cap is the wrong fix

If your drops are too high, lowering this cap will help, but it is a blunt tool. You are telling the dialer it can never go fast, which throttles your good lists along with your bad ones. More often the better move is to leave the cap roomy and let the Drop Percentage Limit do the steering. If you are reaching for this field to fix drops, read our guide to first, because the cap is usually not where the problem lives.

It is also worth knowing how the cap behaves with the related ADAPT_PERCENTMAX method. With that method, when your drop rate touches the Drop Percentage Limit the dialer falls back to a set percentage of this maximum rather than to a flat 1.0. The default is to retreat to half. So on those campaigns the cap is doing double duty: it bounds the top speed and it anchors the fallback speed. On the more common tapered and average methods, the cap is purely a ceiling and the algorithm decides everything below it.

Want this sized to your trunk without the arithmetic? The managed boxes on come with a channel count you can actually see, so picking a sane cap is a five-second decision.