With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteRgLcnTable
x25 Dte Rg Logical Channel Number Table
1.3.6.1.4.1.562.2.4.1.90.7.212
This attribute lists the Lcn components for the X25Dte, which belong to this RemoteGroup. There is an Lcn component listed here for every lcn connection belonging to this RemoteGroup. The lcns were established using either a Peer component linked to this RemoteGroup (in response to a switched call) or using a PermLcn component linked to this RemoteGroup (a permanent connection).
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteRgLcnTable 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.