With IPHost Network Monitor you can run simple snmp requests against a Avaya device in your network.
lhsTxUrunErr
lhs Tx Urun Error
1.3.6.1.4.1.81.19.2.2.1.6
Number of transmit packet underruns.
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IPHost Network monitor allows you to monitor lhsTxUrunErr 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.