An ACA call includes a display message or a voice-synthesized message that states:
That this call is an ACA call
The access code, the trunk group number, and the trunk group member number
The type of referral, either short holding time or long holding time
If the referral call is answered, the system displays this information until the call is released. If the call is unanswered within 3 minutes, the system ends the call. The system places the call again after one hour, and continues to place the call hourly until someone answers.
The attendant or the telephone user who receives the referral call can press the aca-halt button to stop further calls. The aca-halt button is a toggle button, and turns off the ACA feature until the user presses the button again.
