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How the ATA turn on polarity reversal?
Dec 11, 2020
Login web GUI，go into“FXS-->Preferences-->Miscellaneous”page，Enable Polarity Reversal
Application scenarios: Polarity (telephone line A, B line is positive and negative) reversed, as to when to reverse: 1. called off hook 2. the end of the call ,hang up.
Polarity reversal will produce a pulse, so logger can record the user's call start time and end time to complete the valuation.
Test Method: You can use a multimeter to measure the polarity of the negative or vice versa from the off-hook calls.The user port to provide a voltage and the meter to start billing, the call ends up and the user port provide a flip Voltage, billing stop billing.
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