I have a VTO2202 that has been working for years with Vitalpbx and various phones. Instead, the 3221 model registers on the switchboard, receives and answers calls, but does not call because you must necessarily match the VTH extensions on the intercom keypad. So even if you configure the "Villa Station" parameter, it does not make any calls. I think it is impossible to make it work, if you want to try, let me know