Save money by buying standard phone headsets to use with your Cisco phone headset jack
NOT FOR CISCO 7911 7912 etc that do not have the RJ9 Headset Jack,
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 Phones,please See Compatilbe Lists below