Go to the Voxtelesys Portal and log in.
Select "SIP Trunks"
Open the inbound trunk group and click on the Routing tab
Open the route, then press the green plus sign.
Fill in the following information:
Priority: Set the priority of this route to 2 or more.
Destination Type: Set the type to "Transfer" from the drop-down menu.
Destination: Set the phone number you want to transfer to in a failover event.
Outbound Trunk Group: Select the outbound trunk you want the transfer to use.
Your failover priority should be set after your normal routing. Click on Edit priorities to change your route’s priority.
Click on "Confirm Changes" when you are finished.