With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cSipStatsClientBadExtensionIns
Cisco Sip Stats Client Bad Extension Ins
1.3.6.1.4.1.9.9.152.1.2.4.31
This object reflects the total number of Bad Extension (420) responses received by the user agent since system startup. Inbound Bad Extension responses indicate that the recipient did not understand the protocol extension specified in a Require header field.
Back to CISCO-SIP-UA-MIB MIB page.
IPHost Network monitor allows you to monitor cSipStatsClientBadExtensionIns 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.
