In a method for calling participants in a conference call, a computer system receives a conference date, a call time for the conference call, names of the participants, and telephone numbers for the participants. The computer system is operable to automatically initiate computer originated calls to the participants on the conference date at the call time for connecting the participants together for the conference call. The computer system receives one or more pre-set call-back preferences before the conference call is initiated. The one or more pre-set call-back preferences are for use by the computer system if one or more of the participants is not initially connected to the conference call in response to one or more of the computer originated calls. The one or more call-back preferences include a designation of a user-selectable call-back frequency with which each non-answering participant is called back.