As @Maren Mahoney wrote you’ll need to do this in CM with time of day routing. I would however done it slightly differently than what Maren wrote, I’d do the ToD routing in the call forward stage instead of on the directory number itself. That way you don’t need to muck around with multiple DNs and you’ll get a in my opinion a cleaner way of doing this. For the setup I’m suggesting you create a partition with a time schedule to dictate when it’s available. The TS should be defined to include any out of duty time period. Put this into a calling search space where you put the PT with the TS before any of the other PT(s) that doesn’t have a TS. This is important because the order of operation in a CSS uses the order of the PTs as the tie breaker when there is an equal match between two or more routing options and you’d want to have your PT with the TS to have the highest possible match preference. In the PT with the TS setup the routing to send the call to voicemail and none of the other PTs that are in the CSS must have the option to send the call to VM. With this you should be able to control during what time calls would go to VM and when not. This said for clarity the CSS tie breaker that I described before wouldn’t be at play in the setup that I outlined, but I wanted to include it for completeness of how time of day routing operates in CM.
