Axios Now OP's DE does not see it then there are a series of commands to check stuff--don't recall them all now, lshw, blkid, and other see hardware commands. fuzzy on the sequence.
if OP's DE still doesn't recognize USB headset at the GUI level, I wonder if it's as easy as disabling one services or enabling another?
if OP's DE does see the Plantronics headset and the headset still does not work than the service thing is more likely.
Need more info, and this is pure spitballing.
