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Hi! This model seems like a CS520 (From our CS500 Series) which is compatible with an Avaya 9608G. Please note that if you would like to have call control feature (being able to answer/end calls by pressing one button on the headset) your phone also requires an APV-63 cable. If you have any further questions, please don't hesitate to contact our Customer Care Team at: 1-855-765-7878
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