The Vigor2820 now supports the use of a dial-up analogue modem which can be used a backup in the event of the of ADSL line failure.
Vigor2820 requires firmware version 22.214.171.124 and above.
Supported FAX Modem: AFM-102 USB FAX Modem.
The USB Modem menu will appear after the router is restarted with the USB FAX modem attached to the router as shown below:
Enter the required ISP details for the dial-up connection.
Go to “WAN>>Internet Access” configuration menu.
In “USB Modem Backup Setup” select “Always On” for the option in the pull down menu.