With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cProxyCallActiveTxAudioPackets
Cisco Proxy Call Active Tx Audio Packets
1.3.6.1.4.1.9.10.57.1.1.1.1.17
The number of audio packets transmitted to the remote end for this call.
Back to CISCO-PROXY-CONTROL-MIB MIB page.
IPHost Network monitor allows you to monitor cProxyCallActiveTxAudioPackets 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.