Dial Level Difference Target: keeping agents busy safely

Every predictive campaign is balancing two unhappy outcomes. Open too few lines and your agents sit idle waiting for calls. Open too many and a connected caller has nobody to talk to, which is a dropped call. Dial Level Difference Target is the single field that lets you tell VICIdial which side of that line you would rather err on, and it is one of the most direct levers you have.

Agents waiting or calls waiting

The field defaults to 0, which means the dialer aims for a perfect balance, no spare agent and no spare call on average. Set it to -1 and you are telling the dialer to keep, on average, one Agent free at all times. That spare seat acts as a cushion, so when a call connects there is almost always someone ready, and your drop rate falls. Set it to 1 instead and you target having one call sitting on hold waiting for an agent, which keeps everyone maximally busy but raises the odds that a connection arrives with nobody free.

Push the number higher into the positives and you are deliberately stacking calls in queue, which squeezes more talk time out of each agent but reliably drives up your Drop rate. That is the trade in a nutshell: negative buys you a calmer line at the cost of a little idle time, positive buys you busier agents at the cost of more drops.

The go-to fix for high drops

If you are wrestling with a drop rate that will not stay under your limit, setting this field to -1 is one of the first things to try. It costs you a sliver of Occupancy, your agents will be free a touch more often, but it directly cuts the number of answered calls that arrive with no agent to take them. Many operators run permanently at -1 on consumer campaigns for exactly this reason. Our guide to puts this near the top of the list.

The reason -1 is so effective is that it works on the dialer's intent rather than reacting after the fact. The Drop Percentage Limit corrects the pace only once drops have already happened and shown up in the average. The difference target shifts the whole aim of the algorithm so those drops are less likely to occur in the first place. Used together, the target sets the cushion and the limit acts as the backstop, which is a far steadier combination than either one alone.

A companion setting to know about

There is a sibling field, Dial Level Difference Target Method, that only matters once this value is anything other than 0. It decides whether your target is applied just to the dial level calculation or also to the live dialing on each server. If you run a small campaign spread thinly across several servers, the calculation-only option avoids the dialer placing fewer calls than you intended. Like the rest of these knobs, it is ignored entirely in MANUAL and RATIO modes. The shows how all of this fits together with Predictive dialing as a whole.

If you would rather start from a safe baseline and tune up rather than down, the managed boxes on ship with conservative defaults so a fresh campaign dials clean out of the gate.