With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cSipStatsServerGatewayTimeoutIns
Cisco Sip Stats Server Gateway Timeout Ins
1.3.6.1.4.1.9.9.152.1.2.5.9
This object reflects the total number of Gateway Time-out (504) responses received by the user agent since system startup. Inbound Gateway Time-out responses indicate that the server attempting to complete this system's request did not receive a timely response from yet another system it was accessing to complete the request.
Back to CISCO-SIP-UA-MIB MIB page.
IPHost Network monitor allows you to monitor cSipStatsServerGatewayTimeoutIns on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.
