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[roseway]

There's no point in putting filters on unused extension sockets. But it can be helpful in some cases to double-filter by putting a microfilter on the used extension sockets. This can help with Sky boxes for example, because some models have been known to produce significant interference.

[neilius]

To add to roseway's point about naughty Sky boxes, if your extensions are wired from the front faceplate of your NTE5/A master socket, the Mk2 faceplate will filter them anyway. If they've been wired without the ring wire (IDC number 3, usually orange with white stripes), and you notice any phones connected to your extensions not ringing, you can use filters on those to regenerate the ringing signal for them, if you like.