A dialer is an electronic device which makes telephone calls and delivers a recorded
message to anyone who answers the phone. Sometimes a human attendant plays
a part in that once the dialer reaches someone the attendant takes over
the call and pitches the product/service. The dialer can also deliver a
recorded message first and then the called party can request to talk to
a human about the offer by pressing 0 on their touchtone phone.
Other names for dialers are telecomputers, predictive dialers, ADADs (Automatic Dialing and Announcing Devices) and auto dialers.