Predictive dialing is used as an automatic dialing aid when actively contacting customers (outbound). The telephone numbers of customers are automatically dialed from the database. This makes manual, time-consuming dialing by staff unnecessary. Among other things, the predictive dialer recognises fax machines, answering machines/mailboxes and busy signals. If the line is free and the called party answers, the connection is established to the next free employee. Predictive dialing reduces the waiting time of employees between calls and thus increases productivity.