With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pbxMWIErrors
pbx MWI Errors
1.3.6.1.4.1.7505.1.1.11
The number of commands to set or clear a Message Waiting Indicator that the DPA was unable to send successfully to the PBX. Such commands will have been discarded, and the cause written to the DPA's error log. If the DPA is not operating in hybrid mode, this value will always be zero.
Back to CALISTA-DPA-MIB MIB page.
IPHost Network monitor allows you to monitor pbxMWIErrors on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.
