With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
dclTotal3kHzCalls
dcl Total3k Hz Calls
This attribute counts the total number of audio 3.1 kHz 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 dclTotal3kHzCalls 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 modems right now.