As I posted you I think CT you should get this sorted by your BB isp provider as Phones should not have any noise. Do you get the noise if you remove the Computer and filters? if no then it could be a faulty filter. You would then have to try one at a time until you get the noise back. If it's the Line then it will also affect you BB connection. But BT lines should not have any noise on them at all on a Phone.