Draytek Vigor2920 Series User Manual page 57

6. Configure the settings as the following figure. Choose one of the SMS profiles. In this
example, the profile "For warning" is selected. Then, click OK to save the settings.
When such WAN (e.g., WAN2 in this example) disconnects due to some reason, the system
will use other WAN for connection instead and send SMS to notify the user (destination
number #123456789). However, if there is no available WAN for connection, the system will
send SMS to inform the user after reconnecting WAN2 successfully.
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Vigor2920 Series User's Guide