With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvCallActiveEntry
Cisco Voice Call Active Entry
1.3.6.1.4.1.9.9.63.1.3.1.1
The information regarding a single voice encapsulation call leg. The call leg entry is identified by using the same index objects that are used by Call Active table of IETF Dial Control MIB to identify the call. An entry of this table is created when its associated call active entry in the IETF Dial Control MIB is created and call active entry contains the call establishment to a voice over telephony network peer. The entry is deleted when its associated call active entry in the IETF Dial Control MIB is deleted.
Back to CISCO-VOICE-DIAL-CONTROL-MIB MIB page.
IPHost Network monitor allows you to monitor cvCallActiveEntry 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.