custoner called and line 1 wasnt ringing. its a stse. i moved it to line six and programed it and it was ringing. this morning they called and said it wasnt ringing again. i was going to replace the ksu but when i got there it had 130 volts on the co line. when ringing it jumped to 160 vac. when off hook it went to 25 vac. it was high on line one and two but not 3 and 4. a few minutes later it would be ok on 1 & 2 but high on 3 & 4. this happened over and over until the phone company tech popped in. he used his tester and said there was no ac voltage on the line. i put my meter on it right after him and registered ac voltage. i put my volt meter in an ac outlet and it registers correct. anyone have an idea whats going on here. thanks dave