With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vncsVRoutesTable
vncs V Routes Table
1.3.6.1.4.1.562.2.4.1.44.305
This attribute indicates which VoiceRoute components are using this Vncs.
Back to Nortel-Magellan-Passport-VncsCallServerMIB MIB page.
IPHost Network monitor allows you to monitor vncsVRoutesTable 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 modems right now.