That doesn't sound right to me to be putting that 9 or 12vdc over a pair of #24. I also vaguely remember reading in another sparky forum about cat 5 being used as doorbell wire and someone (I won't mention names [Linked Image] ) was holding his ground about using the correct wire for the correct application and I definitely don't feel comfortable having my tip and ring within the same jacket as the 12 vdc that is giving the phone power, I personally like the idea that was presented before using a CL2 rated cable used to locate the transformer remotely.