Check the phone cord connection in the following points:
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Do you use the supplied phone cord or a duplex phone cord?
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Is the supplied phone cord connected to the printer's jack (labeled on the back)?
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Is the other end of the supplied phone cord connected to the wall jack?
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xDSL Modem (with Built-in Splitter)
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xDSL Modem (with External Splitter)
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Is the phone cord clicked into the telephone?