I have upgraded callmanager 4.1 to 6.0 succesfuly and managed to get license files from Cisco with the right quantity of devices and nodes. However after loading the licenses and restarting the callmanager publisher the callmanager service cannot run continously. Once started under control center -> feature services, the page displays the callmanager service started succesfully but the callmanager service shows "not running" and phones cannot register. I have repeated the whole upgrade process again but no success. Has anyone encountered such a problem? Help will be appreciated and rated.