If pulling off the CATV cable and leaving on the AC cable results in hum then I am not sure how adding just a CATV filter is going to help me. One costs $11 and the other is $50 which seems a bit steep.
Keep those suggestions coming. I really hope one of the three phones that I just ordered will solve this problem.
Still wondering why the RF jackextenders dont work on the VoIP line. For me the VoIP line seems to be the source of the hum on my 2 line phone. I would consider isolating it if none of the new phones work.
