Full analysis if the problem  The root cause behind this problem is the delay in sync between CUCM and CCX. CCX and CUCM has an automated sync mechanism which might vary from 5 - 10 minutes based on various parameters. Also there is an option to sync...

This issue is documented to be fixed in 12.0.1 ES03. Documentation must be changed accordingly.  

This event is fixed in UCCX ver 11.6 SU2 For more information, go to: https://www.cisco.com/web/software/286314176/141483/ReadMe-UCCX-11.6.1_ES02.pdf