With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cSipStatsClientCallLegNoExistOuts
Cisco Sip Stats Client Call Leg No Exist Outs
1.3.6.1.4.1.9.9.152.1.2.4.36
This object reflects the total number of Call Leg/Transaction Does Not Exist (481) responses sent by the user agent since system startup. Outbound Call Leg/Transaction Does Not Exist responses indicate that BYE or CANCEL requests have been received by this system and not call leg or transaction matching that request exists.
Back to CISCO-SIP-UA-MIB MIB page.
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