With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cueTotalTimeUsed
cue Total Time Used
1.3.6.1.4.1.9.9.420.1.2.1.8
Total time used in minutes for greetings and messages in all mailboxes. This cannot exceed the cueAllocatedCapacity. If all mailboxes are full, cueTotalTimeUsed will equal cueAllocatedCapacity.
Back to CISCO-UNITY-EXPRESS-MIB MIB page.
IPHost Network monitor allows you to monitor cueTotalTimeUsed on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.