HP LaserJet Pro 400 color MFP M475 - The product is connected to a DSL phone service

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The product is connected to a DSL phone service

Check the installation and features. A DSL modem requires a high-pass filter on the phone line
connection to the product. Contact your DSL service provider for a filter or buy a filter.

Verify that the filter is plugged in.

Replace the existing filter to make sure that it is not defective.