Disable the Vivox SDK internal AEC
How to disable AEC on iOS devices.
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It is possible to disable the Vivox SDK internal acoustic echo cancellation (AEC), which can save processing power and battery. Caution: Only disable the Vivox SDK internal AEC in circumstances where you are certain AEC is not needed, such as when headphones are plugged in or when the Voice-Processing I/O audio unit is activated. To disable the Vivox SDK internal AEC, invoke the
vx_set_vivox_aec_enabled(0)