HP LaserJet Pro MFP M521 series - Use fax on a DSL, PBX, or ISDN system

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Use fax on a DSL, PBX, or ISDN system

HP products are designed specifically for use with traditional analog phone services. They are not

designed to work on DSL, PBX, ISDN lines, or VoIP services, but they work with the proper setup and



HP recommends discussing DSL, PBX, ISDN, and VoIP setup options with the service provider.

The HP LaserJet product is an analog device that is not compatible with all digital phone environments

(unless a digital-to-analog converter is used). HP does not guarantee that the product will be compatible

with digital environments or digital-to-analog converters.