With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
sigChanEQsigActiveChannels
sig Chan E Qsig Active Channels
1.3.6.1.4.1.562.2.4.1.115.2.16.1.1
This attribute indicates the number of currently active channels. This includes data and voice channels.
Back to Nortel-Magellan-Passport-VnetEtsiQsigMIB MIB page.
IPHost Network monitor allows you to monitor sigChanEQsigActiveChannels 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 multiplexers right now.