I followed ALL the steps for troubleshooting including resetting at least 3 times when the DPT restarted all LEDs cam on as usual but BOTH
phone 1 and 2 continue to flash with no phone connected. Afer connection a phone there was no change and no dial tone. I had someone call from
a cell, phone rang ... unable to get any response at all. Person using the cell could not hear me and I couldn't hear them.