Lex does not support returning voice utterances in API response. It only returns transcripts of the input audio.
For data analysis on voice utterances, you can enable Lex conversation logs to access user's voice utterances for data analysis. https://docs.aws.amazon.com/lexv2/latest/dg/conversation-logs-s3.html. The audio data gets stored in a customer specified S3 bucket, which can later be accessed using a Lambda function.
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