I have never seen any dropped call information in the CCM Event Logs. You will see IP phones unregistering (transient connections) but not dropped calls. Do you have CAR installed? I use that to see what the call legs are doing and how long they were established. Try to get the times when the phones are dropping the calls.
Are these drops from IP Phone to IP PHone, IP Phone to PSTN Phone, Both?
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.