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HP Officejet Pro 8600 (N911) and Officejet Pro 8500A (A910) e-All-in-One Printer Series - Faxing Over a Voice Over Internet Protocol (VoIP) Service
Voice over Internet Protocol (VoIP) services provide normal telephone service through a broadband Internet connection rather than a standard telephone network.
NOTE: HP fax products are designed to work with ordinary analog phone services. HP cannot guarantee that the HP fax product will work with a VoIP service. VoIP services are often not compatible with fax machines unless the provider explicitly states they support fax over IP services.
Change the fax speed to 'slow'
Communication fax transmission speed is a major factor when using a VoIP service. The default fax transmission speed for your HP product is medium (14400 bps). If you have difficulty faxing with the medium speed setting, you can lower the speed to improve the product's ability to send VoIP faxes.
Follow these steps to change the fax speed to Slow (9600 bps) on the HP product.
Factors that can cause VoIP faxes to fail
The following factors can cause a fax sent or received on a VoIP network to fail: