With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vncsVpUsageCount
vncs Vp Usage Count
1.3.6.1.4.1.562.2.4.1.44.3.4.1.1
This attribute counts the number of times this VoiceProfile is accessed to set up a connection. This counter wraps to 0 when it reaches its maximum value.
Back to Nortel-Magellan-Passport-VncsCallServerMIB MIB page.
IPHost Network monitor allows you to monitor vncsVpUsageCount 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.