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cordless phone bases shouldn't be right next to your router, as they both use the same range of frequency (2.4 GHz), although mine is but i don't have any control over that, the phone line for the dsl modem/router-in-one is only available in one place.
it is possible for a filter to be faulty, so if the computer's beeping is only audible on one phone, try switching the filters and see if the phone that beeps changes
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