I would bet on the cabling. I have seen this a few times. Run new cables or switch pairs and change the jacks and mounting cords. Good luck

Jim
SST Communications
Long Island New York


Jim Hoey

SST Communications
597 West Montauk Highway
Lindenhurst, New York 11757

631 956-0100

www.sstcom.com

Business telephone systems on Long Island and New York City like Comdial, Vertical, Avaya, Panasonic