A predictive dialer is a computerized system that automatically dials batches of telephone numbers for connection to agents assigned to sales or other campaigns. These predictive dialers are widely used in call centers. As it automatically calls a list of telephone numbers in sequence, it screens out no-answers, busy signals, answering machines and disconnected numbers while predicting at what point a human caller will be able to handle the next call. Predictive dialers are commonly used for telemarketing, surveys, appointment confirmation, payment collection and service follow-ups. It can also measure he number of available agents, available lines, average handle time and other factors to adjust outbound calls accordingly. Many sellers of predictive dialer systems claim that they greatly increase caller productivity. The phone calls you receive from "no one there" are often predictive dialer calls in which a manual caller isn't ready yet.