With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
gsmBcV42FramesRetransmitted
gsm Bc V42 Frames Retransmitted
This attribute counts the total number of frames retransmitted by the IWF V.42 entity in a data call. The V.42 retransmits the same frame when the associated T401 acknowledgment timer time-outs or when a Reject (REJ) supervisory frame has been received from the Public Switched Telephone Network (PSTN) modem. The counter wraps when it exceeds the maximum value.
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IPHost Network monitor allows you to monitor gsmBcV42FramesRetransmitted 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.