With IPHost Network Monitor you can run simple snmp requests against a Avaya device in your network.
promVlanIfIndex
prom Vlan If Index
1.3.6.1.4.1.2167.7.1.1.1.3
Each virtual LAN has a virtual interface associated with it. This enables RMON monitoring to occur per-VLAN. It also provides a handy mechanism to map virtual LANs to bridge ports by mapping them with the ifStack table from the Interface MIB.
Back to PROMINET-MIB MIB page.
IPHost Network monitor allows you to monitor promVlanIfIndex 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.