With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cmmcaMpaAggFailedInvites
Cisco Multi-Modal Contact Applications Mpa Agg Failed Invites
1.3.6.1.4.1.9.9.664.1.6.6.1.4
The total number of failed invitation attempts since application start time specified by cmmcaStartTime.
Back to CISCO-MMODAL-CONTACT-APPS-MIB MIB page.
IPHost Network monitor allows you to monitor cmmcaMpaAggFailedInvites 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.