With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
mcsMgrDprsMcsEpGEpLCoPathUpDateTime
mcs Manager Dprs Mcs Ep G Ep L Co Path Up Date Time
This is the time stamp when the current path was established or reestablished.
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IPHost Network monitor allows you to monitor mcsMgrDprsMcsEpGEpLCoPathUpDateTime 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.