With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cSipStatsServerServiceUnavailOuts
Cisco Sip Stats Server Service Unavail Outs
1.3.6.1.4.1.9.9.152.1.2.5.8
This object reflects the total number of Service Unavailable (503) responses sent by the user agent since system startup. Outbound Service Unavailable responses indicate that this system is temporarily unable to handle received requests.
Back to CISCO-SIP-UA-MIB MIB page.
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