Microphone attitudes

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Hello, I has the following problem: if I with Freephone a number call sit down during my audio gain control (XP) independently a checkmark under Microfon with the small box “clay/tone out”. I have the problem only since I BMW the Player phonostar installed and with photographs the checkmark manuel set. Or is that normal and I knew it not?
What do?

Greeting Haribo

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Behind it came. It is completely normally that the checkmark is set. Thus a feedback is prevented. In any case ones I am heard by my interlocutors.

Haribo