With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
appnRtpLostFrames
appn Rtp Lost Frames
This attribute counts the number of lost frames detected on this pipe. Excessive numbers of lost frames may indicate a problem in the APPN network. This counter wraps to zero.
Back to Nortel-Magellan-Passport-AppnMIB MIB page.
IPHost Network monitor allows you to monitor appnRtpLostFrames 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.