There are 3 main types of auto dialers. They are:
Progressive – Progressive dialers, also called power dialers, automatically call the next number after the previous call is completed.
Predictive – Predictive dialers automatically call multiple numbers at once and connect the answered calls with available agents.
Preview – Preview auto dialers automatically provide agents with a contact record about the prospect. Agents can choose to place the call immediately or review the contact information before initiating the call.