I connected my iphone to my inifiniti via the headphone jack so I can play music and listen to calls through my car's speakers. I used this cable: I can listen to music and phone calls fine. However, the person I am talking on the phone with hears an echo when they talk. I assume they are just hearing themselves from the car's speakers (which is weird because that doesn't happen on the normal speakerphone, so why should it be different coming through my car's speakers?). Does anyone have any ideas of how to get rid of the echo??? Thanks.