With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
lesRegisLastFailCause
les Regis Last Fail Cause
1.3.6.1.4.1.9.9.39.1.1.2.1.13
The cause for the transmission of the last rejection LE_REGISTER_RESPONSE. This variable has the value of the status field within the last failure register response. If the server has never issued a failed registration response then the value of this object shall be 0.
Back to CISCO-LES-MIB MIB page.
IPHost Network monitor allows you to monitor lesRegisLastFailCause 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.