With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmGatewayDevicePoolIndex
Cisco Call Manager Gateway Device Pool Index
1.3.6.1.4.1.9.9.156.1.3.1.1.6
A positive value of this index is used to identify the Device Pool to which this Gateway entry belongs. A value of 0 indicates that the index to the Device Pool table is Unknown.
Back to CISCO-CCM-MIB MIB page.
IPHost Network monitor allows you to monitor ccmGatewayDevicePoolIndex 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.