When I perform a BT quiet line test there's a constant low level hiss, a bit like putting a sea shell to your ear, however not as loud. This noise is exactly the same audio level when the router is plugged in and the phone line is connected to the VDSL faceplate and even when the phone is connected directly to the test socket behind the faceplate with no router connected. I have tested with a 2nd non-branded corded phone and I hear a level of noise on that too. The noise sounds a little different on the 2nd phone with a very faint high pitched tone (that could be the cheap phone and not the line?). Also when performing the quiet line test whilst I powered on the router, I could hear various tones, beeps and screeches from the router sync'ing with the exchange. This was with the router and phone line connected to the VDSL faceplate. Is this normal to hear this on the voice line? The junction box, white cable and master socket / face plate are all less than 2 years old. During my tests I have tested with a different VDSL faceplate with the same results.
Edited by john69 (Sat 30-Dec-17 14:00:55)