With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cgkStatsOriginTotalConcurrentCalls
Cisco Gatekeeper Stats Origin Total Concurrent Calls
1.3.6.1.4.1.9.10.40.1.4.8
The number of concurrent originating calls on the Gatekeeper.
Back to CISCO-GATEKEEPER-MIB MIB page.
IPHost Network monitor allows you to monitor cgkStatsOriginTotalConcurrentCalls 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.