Car kit HF1000

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Hey guys,

I bought HF1000 Car kit (speakerphone?) from Samsung with my friend.
He pair it with Nokia E53, and I pair mine with two SGS+.

When I phone to him its all fine for me and him, but when he (or someone else) phone to me, HE got echo of himself (distant sound?).

But I think if I disable microphone on phone when I talk with someone then there is no ECHO, like the MIC in SGS+ would make the echo efect.

Is it common and can't be fix'd (without turning mic off for each call ? ) or is there some kind of fix/profile/setting?

Thanks for help

any help ?