With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmGatewayTimeLastStatusUpdt
Cisco Call Manager Gateway Time Last Status Update
1.3.6.1.4.1.9.9.156.1.3.1.1.11
The time the status of the gateway changed.
Back to CISCO-CCM-MIB MIB page.
IPHost Network monitor allows you to monitor ccmGatewayTimeLastStatusUpdt 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.