HP LaserJet Pro MFP M521 series - 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 connected.

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