With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccapAppInstHisIPInCallHandedOut
Cisco Call Applications Application Instance History IP In Call Handed Out
1.3.6.1.4.1.9.9.146.1.3.3.1.24
Total number of incoming IP call legs that are handed out to another application instance because of application handoff operation.
Back to CISCO-CALL-APPLICATION-MIB MIB page.
IPHost Network monitor allows you to monitor ccapAppInstHisIPInCallHandedOut 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.