With IPHost Network Monitor you can run simple snmp requests against a Avaya device in your network.
fethPortMulticastReceivedFrames
feth Port Multicast Received Frames
1.3.6.1.4.1.81.12.6.1.1.1.35
This object is the number of Multicast readable (good) frames that have been Received on this port.
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IPHost Network monitor allows you to monitor fethPortMulticastReceivedFrames 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.