Most of these phones have a built-in "headset" ready RJ9 jack. These phones have built-in amplifiers, so no additional amplifiers are needed. Each phone model has very specific requirements for the correct adapter cable (bottom cable) needed. Each bottom cable is listed under the specific brand and model of the each phone. It's imperative that the right cable is used with the compatible headset and phone. It will not work otherwise.
In additional, if you prefer a wireless headset , the pages also shows list of compatible handset lifters and hook switches for each of the phones as well as detail instructions on how to configure them. Most of phones have specific compatible hook switch cables made just for those models.
Go to www.HeadsetPlus.com see a complete selection wireless headsets . You can also contact HeadsetPlus.com directly at toll free 877-999-3838 and speak to one of HeadsetPlus.com sales staff.
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Authorized Internet On-line Dealer for Plantronics Headsets, GN Netcom telephone headset, VXi as well as ClearOne and Polycom Conference Phones