With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
frMuxTimeFramerCongested
Frame Relay Mux Time Framer Congested
1.3.6.1.4.1.1570.1.12.1.4
This attribute accumulates the time (in msec) during which Framer congestion has been observed in the direction towards the interface. The overload causing this statistic to increase may be caused by oversubscription. When this count reaches maximum, it wraps to zero.
Back to Nortel-Magellan-Passport-FrameRelayMuxMIB MIB page.
IPHost Network monitor allows you to monitor frMuxTimeFramerCongested 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.