With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cSipStatsServerBadGatewayOuts
Cisco Sip Stats Server Bad Gateway Outs
1.3.6.1.4.1.9.9.152.1.2.5.6
This object reflects the total number of Bad Gateway (502) responses sent by the user agent since system startup.
Back to CISCO-SIP-UA-MIB MIB page.
IPHost Network monitor allows you to monitor cSipStatsServerBadGatewayOuts on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.