Just to clarify: You have two distinct CUCM clusters, correct? It is not one CUCM cluster that is split across multiple data centers?
You can integrate a UCCX cluster into only one CUCM cluster. If you have one CUCM cluster that is split up between two data centers you can deploy UCCX in an HA over WAN configuration and have one UCCX server reside at each DC.
i was aware of this thing that is one cucm cluster can be integrated with uccx in split mode in HA over WAN. I got the above requirement so i wanted to clarify over this. And thanks for immediate response.