With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cmgwLifNumber
cmgw Lif Number
1.3.6.1.4.1.9.9.324.1.1.6.1.1
An index that uniquely identifies a LIF in the media gateway.
Back to CISCO-MEDIA-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cmgwLifNumber 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.