Does any one have an explanation for why the volume of a hands free kit varies during normal conversation.
The problem started when a friend who I spoke to in the morning on the way to work, changed his car and it had an inbuilt hands free telephone kit. When I rang him up, he had the radio on, the car would turn the radio down and he would speak. But his voice on every word would start loud and drop off. He found out it didn't happen when the radio was completely turned off. I think it may have been something to do with a feedback control of the volume within the car.
This was ok for a while, but recently it has started happening again, although not consistently. Sometimes it is always clear on every call, then next time I would have to ring him back a couple of times to get good sound.
At his end, he says he can always hear me very clearly and as loud as he wants. I sometimes think it may be something to do with my voice being projected in his car, but when I am quiet and he is speaking it still happens.
His car is a Honda Accord with their inbuilt system. I think about 2003 is the year of manufacture, maybe a little later.