You've got me stumped too about the programming, if you are indeed on ext 10 and you can access lines on that set, it should let you in. I would try punching down an extension directly to the block on ext 10 and remove the bridge clips from the other remaining stations. That system is known for doing wierd things when a data pair is reversed. As far as the ringing, have you made sure the top volume knobs are turned up on each phone. Forgive me if this is insulting your intelligence, but as you are new to the board and judging from your profile it looks like you lean more toward the software and TAPI side of things and its' hard for us to determine the experience level of who we are dealing with. You may want to give a little more detail to avoid the "Simple" questions. Was the system just moved, Are none of the phones ringing including ext 10, is the station 10 in DND, etc. and you said you know it's not the phone but how do you know? Tell us what steps you have taken and the results and we may be of some more help.