With IPHost Network Monitor you can run simple snmp requests against a Avaya device in your network.
genOpOctetsReceived
gen Operation Octets Received
1.3.6.1.4.1.52.4.53.1.2.1.22
While a download is in progress this indicates the number of bytes transferred so far.
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IPHost Network monitor allows you to monitor genOpOctetsReceived 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.