With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteLcnRpoa
x25 Dte Logical Channel Number Rpoa
1.3.6.1.4.1.562.2.4.1.90.4.11.1.13
This attribute indicates the RPOA facility which was signalled in establishing this logical channel.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteLcnRpoa 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 speech servers right now.