With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvpdnSessionAttrModemSlotIndex
cvpdn Session Attr Modem Slot Index
1.3.6.1.4.1.9.10.24.1.3.2.1.13
The Modem Pool database slot index if it is associated with this session. Only a session with device of type 'asyncInternalModem' will have a valid value for this object; otherwise, it is not instantiated.
Back to CISCO-VPDN-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor cvpdnSessionAttrModemSlotIndex 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.