Is there a way to change the ear piece volume? Mine seems too quiet and I haven't found a way to change it. Thanks.

To increase or decrease the volume which you adjust during a phone call by turning the centre dial.

I did do that and I figured that's all that should be necessary but neither of my headsets gets all that much louder even at maximum volume.  It sounds like it is muted at least partially.  Any other thought?  Thanks for the reply regardless. Bill.