With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vsrAddressIncompleteCalls
VoiceRoute Address Incomplete Calls
1.3.6.1.4.1.562.2.4.1.117.15.1.5
This attribute counts the calls from the interface which had dialled numbers with insufficient digits to resolve to a unique entry in the VoiceNetworkingCallServer data base. The value wraps to zero when it reaches its maximum.
Back to Nortel-Magellan-Passport-VoiceNetworkingMIB MIB page.
IPHost Network monitor allows you to monitor vsrAddressIncompleteCalls 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.