HP LaserJet Pro 400 MFP M425 - Manual (Page 107)

If faxing problems continue, contact the VoIP provider.
Fax memory contents are retained when there is a loss of power
The flash memory protects against data loss when a power failure occurs. Other fax devices store fax pages
in either normal RAM or short-term RAM. Normal RAM immediately loses data when power is lost, while
short-term RAM loses data about 60 minutes after a power failure occurs. Flash memory can maintain its
data for years without power applied.
Security issues when connecting internal networks to public phone lines
The product can send and receive fax data over telephone lines that conform to public switch telephone
network (PSTN) standards. The secure fax protocols make it impossible for computer viruses to be
transferred from the telephone line to a computer or network.
The following product features prevent virus transmission:
● No direct connection exists between the fax line and any devices that are connected to the USB or
Ethernet ports.
● The internal firmware cannot be modified through the fax connection.
● All fax communications go through the fax subsystem, which does not use Internet data-exchange
protocols.
Fax from the flatbed scanner
1. Place the document face-down on the scanner
glass.
2. From the Home screen on the product control
panel, touch the Fax button.
3. Use the keypad to type the fax number.
4. Touch the Start Fax button.
5. The product prompts you to confirm that you are
sending from the scanner glass. Touch the Yes
button.
6. The product prompts you to load the first page.
Touch the OK button.
ENWW Use fax 91