Why would the Cisco TelePresence System 1000 not be able to reach the CUCM?

A Cisco TelePresence System 1000 is assigned 192.168.3.200/28. There is no LAN misconfiguration. Why would the Cisco TelePresence System 1000 not be able to reach the CUCM?

A.
The CUCM has an IP address of 10.1.1.2.

B.
The CUCM has an IP address of 192.168.3.2.

C.
The CUCM has the same MAC address as the CTS.

D.
There should be no issue.