With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gvcIfDnaDataNetworkAddress
General Vc Interface Dna Data Network Address
This attribute contains digits which form the unique identifier of the customer interface. It can be compared (approximation only) to telephone number where the telephone number identifies a unique telephone set. Dna digits are selected and assigned by network operators.
Back to Nortel-Magellan-Passport-GeneralVcInterfaceMIB MIB page.
IPHost Network monitor allows you to monitor gvcIfDnaDataNetworkAddress 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.