CME routers' IVR redundancy

Hello everyone! I have a question regarding CME routers redundancy. We have to 3925 routers, one is only telephony router witch service module with CUE for IVR. The second one is also 3925 router but is beeing used for networking purposes. My goal is to implement high availabilty for CME using second router as a backup CME. Since it doesn't have service module for IVR, could the xml IVR configuration be used as a backup on the second CME if the primary goes down? And what about performance, should some extra RAM on this backup router has to be added for proper IVR functioning, considering one PRI connection?
Would appreciate your usefull help.

You can modify your configuration to use the local gateway at each site for outbound calls..Configure each ccme to have the local phones register to it and modify your dial-peers to use the local gateway first for outbound calls and the second ccme as backup..
You will need to work with your provider to determione how calls will be routed inbound when one of the PRI fails

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