Join Date: Sep 2008
Location: Shaw employee. My thoughts are my own and not my employers.
What a way to answer your own question...
What type of wiring is it....Cat5 twisted; Cat3 Twisted; the old school wiring (red, green, black, yellow); or, Party line (Red, yellow, blue).
If it's anything other than a twisted pair, you may have a problem. Also, how do you know it's not your PBX. Did you disconnect your PBX and initiate a phone call from the Demarc point? Or are you just guessing?