We are experiencing intermittent issues with our FXO ports on all of our 2800 series routers. When we dial the 10-digit number associated to the specific FXO port, you can see it hit the router, it will ring twice and then give a dial tone. We are using c2800nm-spservicesk9-mz.124-22.T.bin. We are using MGCP and resetting the gateway from call manager does not resolve it. If we reload the router it fixes the issue. We route the call from the 10-digit to a 4-digit number that in a service partition. This 4-digit number is specific to the location. Is there a IOS change that fixes this or a config change that needs to be done. Any help would be greatly appreciated.