Originally Posted by
willflyforcash
I went to radio shack and bought a stereo to mono adapter (female stereo with male mono) and its worked like a dream ever since! Unfortunately, now that I am holding more senior lines, the senior CAs arent all that fond of headsets.

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Hope this info helps any of you who are as puzzled as I was!
You did not need to get an adapter.... inside the battery compartment there are dipswitches that if you put on in a certain order, will let you select mono or stereo output.... The settings are in the manual...