With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteLcnCalledNetworkFax
x25 Dte Logical Channel Number Called Network Fax
1.3.6.1.4.1.562.2.4.1.90.4.11.1.24
This attribute indicates the called network facilities which were signalled in the call packet. A value of null (empty string) means no called network facilities were signalled.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteLcnCalledNetworkFax 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.