Telephone problem with Caller display - ADSL filter related

[Spark123]

One was surface mounted and another upstairs on an internal wall (flush mounted), only got a few hundred K ohms when I first tried.

To the OP, as others have suggested try it with the wiring disconnected before you point the finger of blame at the adsl filter.

 

[b13kal]

If the dropwire from the outside wall has no loop in it and the hole is not sealed then you also going to get rain water in your socket