With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccapAppIntfSMTPReadSuccess
Cisco Call Applications Application Interface SMTP Read Success
1.3.6.1.4.1.9.9.146.1.6.20.1.5
Total number of successful SMTP read transactions done from call applications to this SMTP server.
Back to CISCO-CALL-APPLICATION-MIB MIB page.
IPHost Network monitor allows you to monitor ccapAppIntfSMTPReadSuccess 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.