With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvIfCountInRtp1Messages
Cisco Voice If Count In Rtp1 Messages
1.3.6.1.4.1.9.9.17.1.4.2.1.19
VINES protocol count of input RTP Request messages.
Back to CISCO-VINES-MIB MIB page.
IPHost Network monitor allows you to monitor cvIfCountInRtp1Messages 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.