Seems like a pretty straightforward request. In the past, I've always just set the old employee's phone to forward to the new person for some period of time. I just realized that when doing this, if the new person doesn't answer the phone, the call never goes to the new person's voicemail. It just rings forever.
I saw some posts about creating a Call Routing Application, but I'm not sure that solves the problem. I'd like the new person's phone to ring (or if they have DEE turned on, go to mobile) and then go to voicemail. Doesn't seem it should be difficult to do or a unique question, but I couldn't find an answer in the archives.