With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
traceSessionX25VcCallingDna
trace Session X25 Vc Calling Dna
1.3.6.1.4.1.562.2.4.1.106.3.2.2.10.1.10
This attribute displays the Data Network Address (Dna) of the calling end.
Back to Nortel-Magellan-Passport-X25TraceRcvrMIB MIB page.
IPHost Network monitor allows you to monitor traceSessionX25VcCallingDna 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.