With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteLcnCallUserData
x25 Dte Logical Channel Number Call User Data
1.3.6.1.4.1.562.2.4.1.90.4.11.1.25
This attribute indicates the user data which was signalled in the call packet. A value of null (empty string) means no user data was signalled.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteLcnCallUserData 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.