The Farfi 20cm 3.5mm Omtp Smartphone Headset To 4p4c Rj9/rj10 Phone Adapter Cable Cord is an amazing adaptor that allows you to use your favorite smartphone headset with your for Aastra office phone. more→It converts the standard 3.5mm smartphone plug to an for Aastra RJ9, RJ10, or RJ22 handset plug, providing you with the convenience of using your smartphone headset for work. This adapter outputs binaural sound for stereo headsets, ensuring that you hear sound out of both ears. It is compatible with single 4P4C RJ9/RJ10 handset/headset plugs, making it versatile and suitable for various office phones. By using this adapter, you can save money by buying a smartphone headset or utilize your existing …