With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmVMailDevProductTypeIndex
Cisco Call Manager V Mail Device Product Type Index
1.3.6.1.4.1.9.9.156.1.12.1.1.11
A positive value of this index is used to identify the related product type entry in the ccmProductTypeTable. A value of 0 indicates that the index to the ccmProductTypeTable is Unknown.
Back to CISCO-CCM-MIB MIB page.
IPHost Network monitor allows you to monitor ccmVMailDevProductTypeIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.