With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vsrSvsLCoBytesToNetwork
VoiceRoute Svs L Co Bytes To Network
1.3.6.1.4.1.562.2.4.1.117.2.3.11.1.2
This attribute counts the number of bytes sent to the network over this Logical Connection.
Back to Nortel-Magellan-Passport-VoiceNetworkingMIB MIB page.
IPHost Network monitor allows you to monitor vsrSvsLCoBytesToNetwork 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.