HP LaserJet Pro 400 color MFP M475 - 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