I have a customer with an ADIX 8.XX software. They have 15 digital phones in their office and about 600 - 700ft away they have a plant. (There is a 50 pair running between) In the plant office there are 2 existing telephones and they want to add a 3rd. I had a free extension that I tested at the system that worked. I connected it to the 50 pair and I got the phone to work in the plant office, but when they asked me to move it to another wall I ran a piece of CAT5 and extended the phone and it won't work. I get nothing on the display, if I move it back 20ft to original jack it works, move it 20 feet away and it doesn't. This makes no sense to me at all. Could it possibly be a line length limit that I have reached? I banged my head against the wall with this one for about an 90 minutes and I finally just had to leave. Any ideas? Again this is a digital phone running off of a 408 card.