Not sure I understood your question.
Are you looking for a way to change from vibrate to silent/normal volume profile when call is connected (and possibly to switch back to vibrate after call ends)?
(if so, I don't think there is a setting - though a tasker profile should let you do this fairly easily - if you have the tasker app)
Or does your phone keep vibrating even after call connects? (if so, take it in for repair)