I recently posted about the Jabber Problem Report Tool and the csf-unified.log that turned out to be one of my most popular posts. I had some feedback asking for more info on specific troubleshooting after home cluster is found, so here it is.
Service Discovery Failure Codes (csf-unified.log)
[table id=2 /]
Service Discovery Cache File (service-location.xml)
Located in %appdata%\Cisco\Unified Communications\Jabber\CSF\Config
IMS Result Codes
Client Profile Agent Logs pulled from IM&P Server EPASSoapXXXXX.log
[table id=3 /]