HP LaserJet Pro MFP M521 series - Use fax on a VoIP service

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Use fax on a VoIP service

Voice over internet protocol (VoIP) services are often not compatible with fax machines unless the

provider explicitly states that it supports fax over IP services.

If the product experiences problems getting a fax to work on a VoIP network, verify that all cables and

settings are correct. Decreasing the fax-speed setting might allow the product to send a fax over a VoIP


If the VoIP provider offers a "Pass through" mode for the connection, that will offer better fax

performance on VoIP. Also if the provider has "comfort noise" added to the line, fax performance can

be enhanced if this feature is not enabled.

If faxing problems continue, contact the VoIP provider.