With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gsmBcModemAutoHdlcMode
gsm Bc Modem Auto Hdlc Mode
This attribute indicates whether High-Level Data Link Control (HDLC) functions are being performed by the modem to support HDLC applications (V.42 for example).
Back to Nortel-Magellan-Passport-GsmIwfMIB MIB page.
IPHost Network monitor allows you to monitor gsmBcModemAutoHdlcMode 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.