With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frMuxUnknownDlciFramesFromIf
Frame Relay Mux Unknown Dlci Frames From If
1.3.6.1.4.1.1570.1.12.1.2
This attribute counts frames received from the interface with an unknown DLCI (Dlci which is not provisioned). When the maximum is reached the count wraps to zero.
Back to Nortel-Magellan-Passport-FrameRelayMuxMIB MIB page.
IPHost Network monitor allows you to monitor frMuxUnknownDlciFramesFromIf 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 speech servers right now.