With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frMuxDlciDiscCongestedFromIf
Frame Relay Mux Dlci Disc Congested From If
1.3.6.1.4.1.1570.1.4.13.1.11
This attribute counts the number of frames discarded in the receive direction due to local congestion. When this count reaches maximum, it wraps to zero.
Back to Nortel-Magellan-Passport-FrameRelayMuxMIB MIB page.
IPHost Network monitor allows you to monitor frMuxDlciDiscCongestedFromIf 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.