HP LaserJet Pro MFP M521 series - PBX

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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 a PBX

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

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

Contact the PBX provider for more information and for assistance.