Speech-to-text (STT), also called automatic speech recognition (ASR), is the technology that converts spoken audio into written text in real time. It is the first step in any AI phone call: the system must transcribe what the caller says before it can understand it.
Accuracy matters most with medical terms, medication names, accents, and background noise. Strong STT is what separates an AI call that flows naturally from one that constantly mishears the patient.
Hear it for yourself
A real call from inquiry to booked appointment.
Press play and read along. Echo answers, switches language mid-call, reads live openings straight out of the calendar while it is still talking, then writes the booking back into it. Nothing is left queued for staff to finish afterwards.
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list_available_dates
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Echo in action
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