Abstract: An automatic extension calling apparatus for delivering a prerecorded message (18) to a plurality of predetermined extensions at predetermined times of day. The apparatus is connected to a plurality of PBX trunks (15) via a plurality of interface circuits (16) which connect automatic calling units (30) through concentrators (26) to the PBX trunks. A selective input and display apparatus (41) provides data to a microcomputer (37) for storing (139) signals corresponding to the extension to be called and the time of day at which the call is to be placed. Apparatus is disclosed for distributing a plurality of calls, designated for the same time of day, evenly about this time of day, and means for automatically generating a second stored signal for a second attempt in response to failure of the initial call to be answered are also shown.