Not without changing the programming in #206 and #208 (auto attendant vs. mailbox coverage). That's something that a user won't be able to do on a regular basis.
How about adding an ASA/DXD card, setting the DXD rings lower than the VMS Coverage rings, turn DXD on during the day for a basic auto attendant, turn it off at night, and turn DND on at the covering extension for night service.
