With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cmCallDirection
cm Call Direction
1.3.6.1.4.1.9.9.47.1.3.1.1.7
The modem can be used either as an incoming call or outgoing call. This object specifies the direction of the current or previous call.
Back to CISCO-MODEM-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor cmCallDirection 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.