Automatic Callback (ACB)

System Availability: All systems

When a station user dials a busy station [DN] or outside line access code and receives busy tone, ACB can be activated by pressing an ACB feature Soft Key or by dialing 4. When the busy [DN] or outside line becomes available, the station will be automatically called back and be connected to and ring the originally called station or receive dial tone from an outgoing line.

When ACB is activated, the calling station receives success tone followed by busy tone. Once ACB is activated, the caller can hang up. ACB can be canceled any time using an access code. It will also cancel automatically after a predetermined time.