Usually media servers run in a load balanced mode. I'm not aware of any way to make one active and one backup. To see what the media server is currently doing you can access the web interface and select Server Status on the left side. The Media server will show which CIC servers it's connected to, the current status, and if the server is accepting sessions. This display will also show active resources, which if you have active resources then the media server is processing calls for the CIC server.