‘professional’ microfilter @ £9.40 inc VAT that uses the same filtering components as the BT Master faceplates and as such they quote full compatibility with CLI. This filter appears similar to the ...
If you do not use microfilters, and still want to use a phone then a replacement Master socket cover that filters the ADSL or VDSL2 signal from the extensions is needed. Filtered faceplates are a lot ...
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