With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
x25DtePeerEncAddressType
x25 Dte Peer Enc Address Type
1.3.6.1.4.1.562.2.4.1.90.2.10.1.1
This attribute specifies the encapsulation type for the address of the remote host with which this Peer component allows communication.
Back to Nortel-Magellan-Passport-X25DteMIB MIB page.
IPHost Network monitor allows you to monitor x25DtePeerEncAddressType 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.