With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cmgwIpConfigIndex
cmgw Ip Config Index
1.3.6.1.4.1.9.9.324.1.1.3.1.1
A unique index to identify each media gateway IP address.
Back to CISCO-MEDIA-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cmgwIpConfigIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.