With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvpdnSessionAttrDeviceCallerId
cvpdn Session Attr Device Caller Id
1.3.6.1.4.1.9.10.24.1.3.2.1.10
The incoming caller identification of the user. It is the originating number that called into the device that initiates the session. This object can be empty since not all dial devices can provide caller ID information.
Back to CISCO-VPDN-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor cvpdnSessionAttrDeviceCallerId 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.