HP LaserJet Pro MFP M521 series - ISDN

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The product is an analog device that is not compatible in all digital phone environments. Digital-to-

analog filters or converters may be needed for faxing functionality. If faxing issues occur in an ISDN

environment, it might be necessary to contact the ISDN provider for assistance. HP does not guarantee

that the product will be compatible with ISDN digital environments or digital-to-analog converters.