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There is on mine. I've used it. Maybe a US spec thing? The manual entry does have the dreaded * below.
Volume
▷ "Speed volume": speed-dependent volume control.
▷ "PDC": volume of the PDC signal* com‐ pared to the entertainment sound output.
▷ "Gong": volume of the signal, such as the safety belt reminder, compared to the en‐ tertainment sound output.
▷ "Microphone": volume of the microphone* during a phone call.
▷ "Loudspeak.": volume of the loudspeakers* during a phone call.
The following volumes are only stored for the respective paired telephone: "Microphone", "Loudspeak.".
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