With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdmsLastUserLastChange
Cisco Digital Media Management System Last User Last Change
1.3.6.1.4.1.9.9.655.1.7.4
The date and time at which the last user was added or deleted.
Back to CISCO-DIGITAL-MEDIA-SYSTEMS-MIB. MIB page.
IPHost Network monitor allows you to monitor cdmsLastUserLastChange 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.