With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
tdmaBcV42RemoteBusyIndications
tdma Bc V42 Remote Busy Indications
This attribute counts the total number of times the PSTN modem enters a busy state (the IWF has received a Receive Not Ready message) and asks the IWF V.42 not to send Information (I) frames to it until it is ready to receive information frames again (indicated by receipt of a Receive Ready message or a data message). The counter wraps when it exceeds the maximum value.
Back to Nortel-Magellan-Passport-TdmaIwfMIB MIB page.
IPHost Network monitor allows you to monitor tdmaBcV42RemoteBusyIndications 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 multiplexers right now.