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Hello! Yes, the CS520 is compatible with an Avaya 9611G desk phone. If you would like to have remote control feature to answer/end calls from the headset itself, you would need an APV-63 EHS cable (PN: 38734-11). Please note not all phones support EHS and APV-63 is designed for some Avaya phones including the 9166G. If you have any further questions, feel free to contact our Customer Care Team at: 1-888-363-0726.
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