Coming from the 2616's to the 3905's for the ACD group and having an issue with the headsets. These are NON amplified headsets and when I plug them into the 3905 it sounds just like you would expect...non amplified. To the point you cant hear anything with all volume levels cranked all the way up. I went thru the menu on the phone and tried to choose the headset type but no matter what I choose it doesn't seem to make any difference. Is there a feature in the template I'm missing? Does it not work the way I think it does? Does the 3905 require an amplified headset to work right?