phone line static/noise

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recently got o2 broadband at home, and weve put a two filters on the two downstairs phones, but we still get a huge amount of static on the phoneline, meaning we have to switch of the router to make phone calls or hear the person on the other line.

whats the solution?

 

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we've only got 2 filters plugged in at the moment, both in use downstairs, so the upstairs phone is connected to the bt line without a filter. is this the source of the problem then?

yeah, with the modem off the static is gone

 

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ahh god damn it, theres a phone hard wired into the main socket