I thought maybe the filters are busted (they are around 10 years old), so I ordered some new ones (no-name brand from eBay mind) but that made no difference. My ISP instructed me to try the quiet line test which I did and heard some beeping noises. I then retried it without the ADSL modem plugged in and the line was silent.
The ADSL modem is plugged into a filter then an extension, all phones are also plugged into a filter then the socket. I tried plugging the modem and corded phone into a filter then master socket and unplugged everything else, but still had the same issues with the quiet line test.
So the issue is somewhere with the ADSL... The thing is I thought the point of filters was to separate the voice and data frequencies from interfering with each other. So I'm not sure if the issue is the modem or the filters. Any help would be appreciated.
Edited by lucaspiller (Tue 22-Oct-13 15:12:10)