Plug into your test socket

To do this, you will need to unscrew/unclip both screws/clips on the bottom of your white Open Reach phone socket. Connect the DSL filter to the test port revealed.

Test your line

Connect a corded telephone into your test socket and check for a dial tone. If you had a noisy line but it is now clear, you can perform a quiet line test by dialing 17070.

Test your equipment

Unplug and then plug back in your equipment piece-by-piece including cabling. By testing your connection throughout, you should be able to identify which piece of equipment is faulty and replace as appropriate.