Manual Dialer
A Manual dialer, Where call center agents dial a number either from a preloaded list or by typing with a keypad. Then Agents have to wait for the phone call to connect, which can be either wrong, busy, or reach the answering machine. Since manual dialing does not have the scope of filtering these calls, thus it is the least efficient way of placing outbound calls.
Predictive Dialer
Predictive dialing is a advanced method for call center solution, but it also performs the regular methods for making outbound calls such as power, progressive, or preview dialing.It filters out,busy signals, voicemails, and dead phone numbers and passes the call to live agents as the customer answers the call.