Avaya Compatible Plantronics HW251N VoIP Noise Canceling Headsets 1408, 1416, 2410, 2420, 4606, 4610, 4610SW, 4612, 4620, 4620SW, 4621, 4621SW, 4622SW, 4624, 4625SW, 4630, 4630SW, 5410, 5420, 5610, 5620, 5621, 5625, 6416D+M, 6424D+M, QE4610, 9404, 9406, 9408, 9504, 9508 Bundle of 2 items - Plantronics HW251N Headset and Avaya compatible telephone interface cable Noise-Canceling microphone filters out background sound Compatible Avaya Phones: 14xx, 24xx, 46xx 56xx, 94xx, 95xx