With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteCalledNetworkFax
x25 Dte Called Network Fax
1.3.6.1.4.1.562.2.4.1.90.23.1.25
This attribute specifies the called network facilities to be signalled in a call request packet. A value of null (empty string) at the X.25 interface means no facilities are signalled.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteCalledNetworkFax 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 secure routers right now.