This TR defines Telcordia's view of generic requirements for applications of automatic callback (AC). This is an outgoing call management feature that allows a customer to place a call to the most recent called party. The customer can request AC activation at any time after placing an outgoing call. The busy or idle status of the calling and called lines is monitored and call setup is attempted when both calling and called lines are detected to be idle. This document enunciates the switching and signaling system procedures to support this feature.