Azure Content Understanding uses transcription to convert audio content, such as voicemail recordings, into text. Microsoft’s Azure Content Understanding audio documentation states that transcription converts conversational audio into searchable and analyzable text-based transcripts.
Option A. Voice Live is not the feature used by Content Understanding to convert voicemail recordings into text.
Option B. key phrase extraction identifies important phrases after text is available; it is not the audio-to-text conversion step.
Option D. optical character recognition (OCR) is for extracting text from images or documents, not audio.
Therefore, the correct answer is C. transcription .
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