I have a basic knowledge of phone wiring.

I am working on a DVX I system. A new employee was hired and she needs a phone. She has been using voicemail box 117. So I want to have her phone also be ext. 117. no matter what phone I Plug in to the system right at the box and station 117, it works for about 1 minute then loses power. I can unplug for about 3 minutes and the same thing will happen when I plug it back in.

I thought it was station lock so that is turned off. No dice. any input would be a appreciated! I have a pdf manual, scanned in book and it's not much help, but it does have a mapping of the buttons for when I am in programming mode at station 100!

i should add that the phone DOES work at stations that are already working.