Audicom PC Adapter Headset Computer Stereo Headphone Dual 3.5mm to Phone Rj9/Rj10 Phone Jack Converter for Aastra Adtran BT Alcatel Lucent Avaya Interquartz Lazerbuilt Ascom Telephone IP Phones PC Stereo Headset Adapter Converts Dual 3.5mm to RJ Plug Still get great quality stereo sound from headset via this adapter All functions on headset and phone would function same Easy Setup, Plug and Play Only works for some specific phones. Please see compatible phone models list in description below