With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvIfCountInRtpRedirectMessages
Cisco Voice If Count In Rtp Redirect Messages
1.3.6.1.4.1.9.9.17.1.4.2.1.24
VINES protocol count of input RTP Redirect messages.
Back to CISCO-VINES-MIB MIB page.
IPHost Network monitor allows you to monitor cvIfCountInRtpRedirectMessages 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.