Hi,
If you want to monitor the CPU usage from CUCM using SNMP, below are the OIDs and useful links.
OID for CPU 1.3.6.1.2.1.25.3.3.1.2
OID for memory 1.3.6.1.2.1.25.2.3.1.6
http://snmp.cloudapps.cisco.com/Support/SNMP/do/BrowseOID.do?objectInput=1.3.6.1.2.1.25.3.3.1.2&translate=Translate&submitValue=SUBMIT
If you want to monitor the VM CPU and Host CPU from ESXi SNMPm below are the OIDs and useful links
OID for CPU Table by Virtual Machine 1.3.6.1.4.1.6876.3.1.2
OID for Hardware Processor Table 1.3.6.1.2.1.25.3.3
http://www.circitor.fr/Mibs/Html/VMWARE-RESOURCES-MIB.php
http://selaschuk.blogspot.ae/2013/11/monitoring-esxi-cpumemory-via-snmp.html