Convert 2.5mm plug to CISCO phone single 4P4C RJ9/RJ10 headset plug
Save money by buying standard phone headsets to use with your Cisco phone headset jack
Reduce clutter with single headset
DOES NOT work with RJ11 jack, which is wider than your handset or headset jack (6 positions vs. 4). RJ11 jack is what is in the wall. RJ9, RJ10, RJ22 are what is on your phone handset or headset.
Works only with CISCO and ATIVA phones with headset jacks