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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.

  1. On the control panel, touch the Right Arrow ().

  2. Touch Setup ().

  3. Touch Fax Setup.

  4. Touch Advanced Fax Setup.

  5. Touch the Down Arrow () to scroll to Fax Speed, and then touch Fax Speed.

  6. Touch Slow (9600 bps).

  7. Touch Home () to return to the home screen.

  8. Try faxing at the new speed.

    If you continue to have problems faxing, contact your VoIP provider. Your VoIP provider might suggest some ways to improve the ability to send and receive faxes over VoIP telephone service.

Factors that can cause VoIP faxes to fail

The following factors can cause a fax sent or received on a VoIP network to fail:

  • The timing of VoIP signals causes the fax transmissions to fail.

  • There is a slight delay in the signal because of the time it takes to create the Internet packets.

  • Internet traffic becomes heavy and packets are lost.

  • Heavy Internet traffic increases latency, which then exceeds the fax timing requirements.

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