Convert two 3.5mm plugs to single 4P4C RJ9/RJ*0 handset plug.
Save money by buying PC headsets to use with your Aastra and Avaya
office phone's handset jack.
Reduce clutter with single headset.
Does not work with RJ*1 jack, which is wider than your handset or
headset jack (6 positions vs. 4). RJ*1 jack is what is in the wall.
RJ9, RJ*0, RJ*2 are what is on your phone handset or headset.
