If this is a DSL connection, you need to install filter units on your phone lines to keep the regular telephone voice signal from interfering with the DSL signal. The filter(s) should have been provided by the ISP as part of the setup kit; if they weren't, call the ISP and ask them to send you some.
If you did install the filter(s), you may have a faulty one, in which case it will need to be replaced.
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Wombat At Large
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