Draytek Vigor IPPBX 2820 Series User Manual page 59

Backup Trunk
Move Up /Move Down
After finishing all the settings here, please click OK to save the configuration.
VigorIPPBX 2820 Series User's Guide
It will be triggered when the original trunk is not registered
or receives failed response.
Click this button to move the selected item to the upper
place/ lower place.
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