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Use Fax over VoIP networks
VoIP technology converts the analog phone signal into digital bits. These are then assembled into packets which
travel on the Internet. The packets are converted and transmitted back to analog signals at or near the
destination.
Transmission of information on the Internet is digital instead of analog. Therefore, there are dierent constraints
on the fax transmission that might require dierent fax settings than the analog Public Switched Telephone
Network (PSTN). Fax is very dependent upon timing and signal quality, so a fax transmission is more sensitive to
a VoIP environment.
The following are suggested changes in settings for the HP LaserJet Analog Fax Accessory 500 when it is connected to a
VoIP service:
●
Begin with the fax speed set in Fast (V.34) mode and with Error Correction Mode (ECM) turned on. The V.34
protocol handles any changes in transmission speed needed to accommodate VoIP networks.
●
If numerous errors or retries occur with the fax speed set to Fast, set it to Medium (V.17).
●
If errors and retries persist, set the fax speed to Slow (V.29) because some VoIP systems cannot handle the
higher signal rates associated with fax.
●
In rare cases, if errors persist, turn o ECM on the product. The image quality might decrease. Ensure that
the image quality is acceptable with ECM o before using this setting.
●
If the preceding setting changes have not improved the VoIP fax reliability, contact your VoIP provider for
help.
194 Chapter 8 Fax ENWW
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