Upstate, are you sure it can be done? At least with the extension he's needing to use?
I have an X-class... anytime an extension isn't plugged in, the system freaks out and routes the call to the operator extension. Ended up giving everyone an info mailbox, (with a silent greeting message) which then routes to their extension. This way they give out a virtual extension number to the public. Someone calling in, only knows the virtual number, the directory is set up for it too.
The one guy whose only extension is an IP phone, and is often on the road (phone not connected), I set up his programming to go to the info mailbox (virtual extension) then to a department, and then finally to a guest mailbox, which he has a virtual mailbox key programmed for (never can use his built-in key). WIth the department programming, the phone doesn't need to be connected for the department ringing and forwarding to work.
