With IPHost Network Monitor you can run WMI Incoming Calls Persec monitoring of various devices in your network.
To create a WMI monitor for Incoming Calls Persec, provide host name (it must be a Windows host) and specify custom WQL query:
The rate of incoming calls answered by this computer.
The Telephony System
IPHost Network Monitor is an advanced and easy tool for monitoring LAN and WAN networks, network servers, workstations and TCP/IP devices. Use IPHost Network Monitor to monitor your servers, domains, computers and devices.