With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
voicePortIfConfigTable
voice Port If Config Table
1.3.6.1.4.1.9.5.1.26.1
determined by the number of modules in the chassis and the number of ports with the voice port interface configuration capability in the system.
Back to CISCO-STACK-MIB MIB page.
IPHost Network monitor allows you to monitor voicePortIfConfigTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.