With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DteT21CallTimer
x25 Dte T21 Call Timer
1.3.6.1.4.1.562.2.4.1.90.21.1.6
This attribute provides the period in milliseconds within which a call request packet should be confirmed.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DteT21CallTimer 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 switches right now.