With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cegTotalIdleUsers
Evolved Packet Core Gateway Total Idle Users
1.3.6.1.4.1.9.9.731.1.3.5
This object represents the total number of users currently in Idle state in the gateway.
Back to CISCO-EPC-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cegTotalIdleUsers on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.