How can you make the display show the caller's actual phone number on an extension that is ringing because it has primary cover for another? On extension say 318 and 356, we have a cover for a phoneless phantom adjunct 320. When a call comes in for 320, 318 and 356 ring, but their displays only say that it is a coverage call for 320. How do I get the actual number for the external call coming in? We have a merlin magix system with service provided by a fractional T1 and DIDs. We have Avaya 4404d+ and 4424d+ phones. When a call is placed directly to 318 or 356, the calling number is displayed.