I was able to do this, but it did require a bit of wiring. Make sure the modular wire running from your ATA to the phone jack are indeed serving the tip/ring pair you think they are. If your house is wired with CAT5, you likely have 4 tip/ring pairs. Just make sure your wiring is correct. It should work. I have my ATA on the basement level were my office is, and I feed phones on the second floor without issue nor a boost in voltage.