Is that an extension for the original line, or a second line/number? Who fitted it? A BT engineer or a house electrician or who? This matters, as the wrong cable may have been used, and the wrong connections made.
If it is an extension, carefully open the master socket by unscrewing the bottom half. Be careful as there should be three wires attached to the back, see this pic
Gently ease out the wire to T3. Don't cut it, just coil it a little to make sure it doesn't touch any contacts when you put it all back. That is the ring wire and is rarely needed these days. It is often a source of major ADSL interference.
Is there anything plugged into the other socket? If so, what, and is it going through one of the dangly filters?
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Edited by RobertoS (Wed 11-Jul-12 00:19:45)