How will it function/work?

With TeleMail or any answering device; a message be deposited in customer mailbox or saved on any answering device on the first day and customer wonâ€™t be notified again.
No TeleMail or any answering device; customer telephone will ring on the 1 st day between 19:00 - 21:00 . If not picked up, the system will call again the next day between ( 19:00 - 21:00 ); if not picked up on the 2nd day then the message will expire automatically.
When customer answers the phone; the system registers a successful call and does not remind the customer again, provided that customer have listened to the full message.