FAC used by a Centralized Attendant Service (CAS) attendant to place calls on hold and answer calls held at a remote server running Communication Manager. This FAC can also be used by an analog station. Flashing the switch-hook for the proper interval (between 200 and 1000 ms) while talking on an existing call causes the existing call to be placed on soft hold, using which the analog user can dial the Answer Hold-Unhold FAC to Hard hold the call.

This value must conform to the FACs or dial access codes defined by the dial plan.