With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteRpoa
x25 Dte Rpoa
1.3.6.1.4.1.562.2.4.1.90.23.1.14
This attribute specifies the value of the RPOA facility to signal in a call request packet. The value of null (empty string) at the X.25 interface means no RPOA facility is signalled.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteRpoa 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.