With IPHost Network Monitor you can run simple snmp requests against a Avaya device in your network.
ipxServNetNum
ipx Serv Net Num
1.3.6.1.4.1.81.31.2.3.1.4
The IPX network number portion of the IPX address of the service.
Back to CROUTE-MIB MIB page.
IPHost Network monitor allows you to monitor ipxServNetNum 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.