With IPHost Network Monitor you can run simple snmp requests against a Avaya device in your network.
xsSubnetMatrixControlIndex
xs Subnet Matrix Control Index
An index that uniquely identifies an entry in the xsSubnetMatrixControlTable. Each such entry defines a function that discovers conversations on a particular interface and places statistics about them in the xsSubnetMatrixSDTable and the xsSubnetMatrixDSTable, on behalf of this xsSubnetMatrixControlEntry.
Back to SMON2-MIB MIB page.
IPHost Network monitor allows you to monitor xsSubnetMatrixControlIndex 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.