With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteLcnCallDirection
x25 Dte Logical Channel Number Call Direction
1.3.6.1.4.1.562.2.4.1.90.4.12.1.3
This attribute indicates the direction of the call that caused the establishment of this channel.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteLcnCallDirection 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.