An Auto Attendant is a voice menu system that allows callers to be routed to an extension, department group, or ring group without going through a telephone operator or receptionist.
The auto-attendant is also known as a digital receptionist or IVR.
Having an Auto-Attendant as the front line for your VoIP telephone system is a very useful and economical way of handling your incoming call distribution. It replaces/helps the human operator by automating and simplifying the incoming phone calls procedure.
Auto Attendant menus can be used in many parts of the telephone system, most commonly at the front end, but are also commonly used for out of hours as well.