I have tried using two different bluetooth headsets with my iphone 6 and when using the headset and hitting the "call" button on the iphone, the volume will sometimes go to maximum level.
Basically I push the "call" button on the bluetooth headset and sometimes the "beep" noise that brings up Siri is extremely loud. To remedy the issue, I have to turn down the volume on the bluetooth headset, but when I do this it shows the volume as minimum on the iphone. For some reason this actually does bring down the volume, but is only temporary. Randomly it will get set back to maximum.
Is there any way to fix this?