With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
btdsMcdnTSlotTable
btds Mcdn T Slot Table
This attribute displays the operational mode of every time slot which is serviced by a voice service. The value idle means that the time slot is not used to service a call, hence the concerned voice service's bandwidth in the Passport subnet is available for other uses. The value voice means that a phone call is in progress. All provisioned voice service's value added features have been activated (features such as voice compression, silence suppression, echo cancellation). The value data means that a data call is in progress. All provisioned voice service's value added features have been de-activated, so that a clear 64 kbit/sec data connection is provided accross the Passport subnet.
Back to Nortel-Magellan-Passport-BitTransparentMIB MIB page.
IPHost Network monitor allows you to monitor btdsMcdnTSlotTable 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 switches right now.