atcomsystems.ca/forum Forums TDM Business Telephone Systems NEC Telephones & Systems NEC DSX 40 Caller ID Problem

Have u Tried frogging the line 1 to Line 2,3,4 , if Line 2 works on Line 1 etc , Could be AC inductance or interference , it will work on a butt set or cheap caller id box , but won't work on Pbx Line card ,,cause it wasn't designed for it ,, ac inductance shoudn't be higher then 40, or 50 millivolts in Canada.