With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
traceRcvrX25DnaCugType
trace Receiver X25 Dna Cug Type
1.3.6.1.4.1.562.2.4.1.106.2.2.2.2.10.1.1
This attribute specifies the CUG type as either national or international. A national CUG has significance within the local network only. An international CUG has significance across network boundaries.
Back to Nortel-Magellan-Passport-X25TraceRcvrMIB MIB page.
IPHost Network monitor allows you to monitor traceRcvrX25DnaCugType 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.