With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cmedxCmdNumAddFails
cmedx Cmd Num Add Fails
1.3.6.1.4.1.9.10.104.1.2.2.1.1
Total number of cumulative ADD commands failed in the media gateway link.
Back to CISCO-MEGACO-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cmedxCmdNumAddFails on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.