I had the same problem, with 4 CT adapteres R6a. They would not start properly when plugged in. The LED flashed at the wrong rate. I never got to the bottom of the problem, just replaced them.
There was a problem with a current limitation circut for a while. That can be solved with a resistor connected in serial with the PBX line. (If I remeber correct we used 1000 ohm)
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