With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoUnityEventType
cisco Unity Event Type
1.3.6.1.4.1.9.9.385.1.3.1
The classification on the event severity. error(1) Error events indicate significant problems that the user should know about warning(2) Warning events indicate problems that are not immediately significant, but that may indicate conditions that could cause future problems. informational(3) Information events indicate infrequent but significant successful operations.
Back to CISCO-UNITY-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoUnityEventType on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.