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Call Center Hands-Free RJ9 Headset Headphone Monaural Mic Mircrophone Noice Cancelling + Extra Cushions for Avaya Nortel Nt Yealink Ge Emerson Viop POE NEC Mitel Office Desktop IP Telephone PhoneJust plug directly into your headset-ready telephone or into the handset port if your phone do not include the headset port function, Most simple setup hea..