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During a call on the headphones, the headphones' microphones pick up ambient sound regardless of the settings of the Ambient Sound Control function. This is an intentional feature to enhance the call experience and not a malfunction.
Thanks to the Sidetone function, the noise canceling function of your headphones works differently during a call than when playing music. If you hear ambient sound, headphone operation sound, or white noise (i.e., a small electrical noise with continuous static sound) during a call, that is also an effect of Sidetone and not a malfunction.