With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cVoiceCardIndex
Cisco Voice Card Index
1.3.6.1.4.1.9.9.300576.1.1.1.1
A unique value, greater than zero, used to index the cVoiceCardTable.
Back to CISCO-VOICE-CARD-MIB MIB page.
IPHost Network monitor allows you to monitor cVoiceCardIndex 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.