With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccapAppGblActIPOutCallNowConn
Cisco Call Applications Application Global Active IP Out Call Now Connection
1.3.6.1.4.1.9.9.146.1.4.5
Total number of IP outgoing (placed to IP) calls connected and handled by this gateway at this moment.
Back to CISCO-CALL-APPLICATION-MIB MIB page.
IPHost Network monitor allows you to monitor ccapAppGblActIPOutCallNowConn on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.