With IPHost Network Monitor you can run simple snmp requests against a Avaya device in your network.
smartIfExtensionViNet
smart If Extension Vi Net
1.3.6.1.4.1.81.27.3.1.1.3
Virtual Net Number. Value '0' for generic mode. The value for not supported is 511.
Back to SMARTD-MIB MIB page.
IPHost Network monitor allows you to monitor smartIfExtensionViNet 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.