Virtual Receptionist

I would like to set up the Virtual Receptionist instead of voicemail on a specific extension, is this possible?
i.e. My main phone number would ring through to x101 during business hours, instead of the VR. If x101 doesn’t answer, then VR would pick-up so caller could choose their extension destination.

Set the main phone number to ring to a Ring Group. Set that ring group to ring in sequence to 101 then to the extension for the VR (100). When the person at 101 is out, he/she can set the do not disturb so calls will go immediately to 100.