Thinking out loud might possibly work is to set the station to go off-hook to Co lines and then set station number to a different numbering of all other telephones and place it on button 11-20 on a ten button telephone set. Just a thought?
That's certainly thinking outside the box... but put it on a mythical ADM instead... (I do this with a Phtm I use to delay ring to VM)
The problem I see is with many other features... Paging, Voicemail, Hold, etc... might be able to work through all of them (pool keys, VM keys, etc) - but it seems like the real question is why disallow ext to ext calls in the first place?
