Multitech MultiModem MT4X56USB User Manual page 52

MultiModemUSB User Guide
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EC is added to these result codes when the extended result codes configuration option is enabled. EC is replaced by one of the following
codes, depending on the type of error control connection:
V42bis —V.42 error control (LAP-M) and V.42bis data compression
V42 —V.42 error control (LAP-M) only
MNP5 —MNP 4 error control and MNP 5 data compression
MNP4 —MNP 4 error control only
NoEC —No error control protocol).
For more information on scripting, click the Help button.
52 MT4X56USB