We recommend consulting the manufacturer's telephone compatibility guide before purchasing headsets. Please find the guide here
The Plantronics HIC Adapter Cable allows you to directly connect your headset to specific Avaya IP phones, including the following models: 2410, 2420, 4406, 4412, 4424, 4406D+,
4412D+, 4424D+, 4424LD+, 4610SW, 4620, 4620SW, 4621SW, 5410, 5420, 5610,
5620, 6416D+M, 6424D+M. The Quick Disconnect (QD) capability allows the
headset to detach without losing the call.