The Headset Buddy RJ9 to USB Type A adapter is a simple solution for users adapting their desk phone headset to all types of computers. The universal switch allows you to use many types of different headsets without using several different adapters. Works on both wired and wireless headsets! Switch settings: Position (5) for 90% of existing phones, Compatible with Microsoft Teams, compatible with Five9, compatible with Cisco Jabber & IP Communicator, compatible with Avaya One-X and IP Office and many other softphones.