With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccvpIcmAggH323CallLegs
Cisco Customer Voice Portal Icm Aggregate H323 Call Legs
1.3.6.1.4.1.9.9.590.1.6.4.1.13
The Intelligent Contact Management (ICM) application has the ability to accept Voice over IP (VoIP) calls that originate via the Session Initiation Protocol (SIP) or H.323 protocol. The aggregate H323 call legs object is a metric indicating the total number of calls received by the ICM application via the H.323 protocol since system start time.
Back to CISCO-CVP-MIB MIB page.
IPHost Network monitor allows you to monitor ccvpIcmAggH323CallLegs 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.