With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
dclTotalSpeechCalls
dcl Total Speech Calls
This attribute counts the total number of speech calls that have been handled by this DcmeLink, including rejected calls. This counter wraps to zero when it exceeds its maximum.
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IPHost Network monitor allows you to monitor dclTotalSpeechCalls 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 secure routers right now.