A local has just moved broadband from a dedicated line to the house phone. The filter is plugged into the master socket. Quiet test on the phone is fine. Switch on router and, after 10 or so seconds, the phone becomes noisy (a reasonably loud hiss).
I've tried three different filters, and used a new lead from filter to (Thompson) router. I can only think that the router is causing it somehow, but fail to see how. I shall try another router next week but, in the meantime, anyone any thoughts on this odd snag?
Thanks. BB activated and working. Corded phone. Don't think there's a line fault as the BT silent line test is just that - silent. It's only when the router is connected and on that there is the problem. Same with the WiFi off.
Does the master socket have a test socket? Try the router and phone from that. If you still hear a hissing sound on the phone in my humble opinion it could be a line fault. The test socket proves/disproves that your house wiring is ok.
rdave. I don't think line fault as all is quiet until the router is switched on. I have used the test point in the master socket with same result. For now I'll assume router, and report back when I've had chance to try the spare.