With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvCallActiveCallingName
Cisco Voice Call Active Calling Name
1.3.6.1.4.1.9.9.63.1.3.1.1.13
The calling party name of the call. If the name is not available, then it will have a length of zero.
Back to CISCO-VOICE-DIAL-CONTROL-MIB MIB page.
IPHost Network monitor allows you to monitor cvCallActiveCallingName 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.