With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
btdsDpnss1DataToVoice
btds Dpnss1 Data To Voice
This attribute counts the number of messages indicating a change of a call operational mode from data transmission to voice transmission. This count wraps to zero after reaching its maximum value.
Back to Nortel-Magellan-Passport-BitTransparentMIB MIB page.
IPHost Network monitor allows you to monitor btdsDpnss1DataToVoice 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 modems right now.