Headset Headphone Hands-Free + Microphone Compatible for Only Avaya 9608 9608g Avaya 9620l Avaya 1608-i Only ONLY compatible with Avaya 9608 9620 1608. Please make sure compatible before purchase No additional amplifiers or adapters required. Superior quality sound with the flexible adjustable noise cancellation microphone. Most easy setup headset solution, Extra ear and mic cushions. Shirt clips included. NO Mute / Volume Control built in.