If you can not change the 3 mins limitation.Perhaps, you can pass the call to CUC, then use call handler to pass back the calls to CUCM hunt pilot.

would you please upload the problem report log ?

I find that I can change the password after I add the command "aaa authentication enable console LOCAL" .problem solved.

You can adjust the high and low watermarks. The system will delete some log.https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/200581-Procedure-to-Adjust-WaterMark-in-RTMT-of.html

You are saying that you are working from home now.Are you using expressway or VPN?Does the jabber work normally when you are in office?