Its interesting to watch a call fail. Even more interesting, you can see the dial-peers of the CUBE in action when you have the preference command for dial-peers that match a destination pattern. In this example, you have two CUCMs (publisher and subscriber) and both end up not being able to take the call. Its interesting to see the CUBE send to both though, indicating that it tried to send the packets (the call) to the second CUCM when the first one failed.
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