With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoUnityPortIndex
cisco Unity Port Index
1.3.6.1.4.1.9.9.385.1.1.2.1.1
An arbitrary integer, selected by the local Unity, which uniquely identifies a port on the local Unity server.
Back to CISCO-UNITY-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoUnityPortIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.