Use this procedure for all of your destinations that will provide Basic Callback only.
In the Trailhead.properties file:
List each Destination using the Destination<n>.Name property:
Destination1.Name=Boston1
Define the Destination type. Use CALLONLY for Basic Callback.
Destination1.Type=CALLONLY
Enter the URL that should be served for this destination using the Destination<n>.URL property:
Destination1.URL=http://<trailhead-host-name>/CiscoTH/pub/html/forms/blender/boston1.html
Define a connection to which this call should be queued:
Destination1.QueueConn=<local servername of connection to use>
Important: This connection name should be the name listed in the localservername property on theTrailhead server, the machine that ultimately processes the destination.