With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmGatewayTable
Cisco Call Manager Gateway Table
1.3.6.1.4.1.9.9.156.1.3.1
The table containing the list of all gateway devices which have tried to register with the local CUCM at least once. When the local CUCM is restarted, this table will be refreshed.
Back to CISCO-CCM-MIB MIB page.
IPHost Network monitor allows you to monitor ccmGatewayTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.
