With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccvpIcmIntSipCallLegs
Cisco Customer Voice Portal Icm Interval Sip Call Legs
1.3.6.1.4.1.9.9.590.1.6.4.1.7
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 interval SIP call legs object is an interval specific snapshot metric indicating the number of calls received by the ICM application via SIP during this interval period.
Back to CISCO-CVP-MIB MIB page.
IPHost Network monitor allows you to monitor ccvpIcmIntSipCallLegs 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.