With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cSipCallActiveId
Cisco Sip Call Active Id
1.3.6.1.4.1.9.9.995.1.1.3.1.1
This object represents the protocol specific unique identifier for this call.
Back to CISCO-SIP-CALLS-MIB MIB page.
IPHost Network monitor allows you to monitor cSipCallActiveId 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.