Are you sure on that Tom...being that the 280 has 3-digit extensions....I tried the DK8/16 because they have the (default) 2-digit extensions..and similiar backplane cabinet/card setup....and that didn't work...but ironically the Lingo "viewed" the DK16 as 3-digits as well (200-xxx).

I know you can input your own range...which I did with the DK16 entry..but once again that didn't work. I performed the ID codes on one extension and tried to transfer from AA to that and it wouldn't transfer...it went back to main greeting after a few seconds.

Also, I can't connect via PC...apparently it's not reading because of USB-to serial adapter issues...which I've heard happens sometimes with Cocessions.....my adapter works fine on all other systems/applications on same laptop etc.