Chapter 10 Install and System Administration for FortiOS 5.0 : Advanced concepts : Modem
  
Modem
FortiGate units support the use of wireless, 3G and 4G modems connected using the USB port or, if available, the express card slot. Modem access provides either primary or secondary (redundant) access to the Internet. For FortiGate units that do not include an internal modem (those units with an “M” designation), the modem interface will not appear in the web-based manager until enabled in the CLI. To enable the modem interface enter the CLI commands:
config system modem
set status enable
end
You will need to log out of the FortiGate and log back in to see the modem configuration page at System > Network > Modem. Once enabled, modem options become available by going to System > Network > Interface.
Note that the modem interface is only available when the FortiGate unit is in NAT mode.
To configure modem settings, go to System > Network > Modem.
Configuring the modem settings is a matter of entering the ISP phone number, user name and password. Depending on the modem, additional information may need to be supplied such as product identifiers, and initialization strings.
The FortiGate unit includes a number of common modems within its internal database. You can view these by selecting the Configure Modem link on the Modem Settings page. If your modem is not on the list, select Create New to add the information. This information is stored on the device, and will remain after a reboot.
Fortinet has an online database of modem models and configuration settings through FortiGuard. A subscription to the FortiGuard services is not required to access the information. As models are added, you can select the Configure Modem link and select Update Now to download new configurations.
See Also
USB modem port
Modes
Additional modem configuration
Modem interface routing