With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cmmcaRdaRtNumActiveClients
Cisco Multi-Modal Contact Applications Rda Rt Num Active Clients
1.3.6.1.4.1.9.9.664.1.6.3.1.5
The real time number of active end-user devices that have capability to perform instant message operation.
Back to CISCO-MMODAL-CONTACT-APPS-MIB MIB page.
IPHost Network monitor allows you to monitor cmmcaRdaRtNumActiveClients on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.