With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmTrunkGatewayIndex
Cisco Call Manager Trunk Gateway Index
1.3.6.1.4.1.9.9.156.1.4.1.1.4
A positive value of this index is used to identify the Gateway to which this Trunk entry belongs. A value of 0 indicates that the index to the Gateway table is Unknown.
Back to CISCO-CCM-MIB MIB page.
IPHost Network monitor allows you to monitor ccmTrunkGatewayIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.