With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
ipivcLcnVcFrmRetryTimeouts
ipivc Logical Channel Number Vc Frm Retry Timeouts
This attribute counts the number of frames which have retransmission time-out. If packets from Vc into the subnet are discarded by the subnet, the source Vc will not receive any acknowledgment. The retransmission timer then expires and packets will be retransmitted again. Note that the Vc idle probe may be retransmitted and is included in this count. This statistics does not show the distribution of how many times packets are retransmitted (e.g. first retransmission results in successful packet forwarding).
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IPHost Network monitor allows you to monitor ipivcLcnVcFrmRetryTimeouts on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Nortel speech servers right now.