The last phone destination cannot be deleted from a destination group if that will result in the group having only SMS or SMTP destinations.
Procedure
Step 1
In the Personal Call Transfer Rules web tool, from the Destinations menu, select View Destination Groups.
Step 2
On the Destination Groups page, select the name of the group.
Step 3
On the Destination Group page, check the check box for the destination you want to delete from the group. You can check multiple check boxes to delete more than one destination at a time.