HP LaserJet Pro 400 MFP M425 - 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.