I know that using route lists allows having redundancy when a first H323 gateway in the route list has all its local voice ports being busy. That works fine.
I'd like to provide the same redundancy mechanism when all remote voice ports are busy. So my local H323 gateway would have free voice ports, but the call would not be successful because of remote gateway being busy/unreachable. My tests using a route list are not successful for this.
Is this supported? Using network busyout is not an option as my remote gateway is not reached through IP but rather through isdn.