Can someone explain?
Event Type: Error
Event Source: Cisco CDR Insert
Event Category: None
Event ID: 3
Error: kErrorNotCDRPrimary - InsertCDR service is being run on a server that is not the CDR primary
App ID: Cisco CDR Insert
Cluster ID: StandAloneCluster
Explanation: InsertCDR service is being run on a server that is not the CDR primary
Recommended Action: Either disable the service or change the Enterprise Parameter for PrimaryCDRUNCPath.
It means you are running the CDR service on the subscriber which need to be stopped, as this service run only on the publisher. So to get rid of this error do the following on your subscriber:
Application > Cisco CallManager serviceability
Tools > Service Activation-> your Subscriber-> uncheck Cisco CDR Insert, and click Update
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