With IPHost Network Monitor you can run simple snmp requests against a Avaya device in your network.
cjnIpInAddrErrors
Cajun Ip In Address Errors
1.3.6.1.4.1.52.4.43.2.1.4.3
The number of input datagrams discarded because the IP address in their IP header's destination field was not a valid address to be received at this entity. This count includes invalid addresses (e.g., 0.0.0.0) and addresses of unsupported Classes (e.g., Class E). For entities which are not IP Gateways and therefore do not forward datagrams, this counter includes datagrams discarded because the destination address was nota local address.
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IPHost Network monitor allows you to monitor cjnIpInAddrErrors on Avaya device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Avaya IP phones right now.