message tone when on a call?

i bet there easy fix im yet find yet noticed since ive had 4s
when im on call , text message comes in, message tone of text takes on ear piece, not can not hear other person talking deafens me

please tell me there way stop this?

 

if using headphones have sound play. if using phone without headphones play text tone if phone on loud. need turn phone on silent (vibrate).

 

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