Work with specific Avaya phone models only (no need amplifier): 1408 1416 2410 2420 4424LD+ 4424D+ 4412D+ 4406D+ 4610 4610SW 4620 4620SW 4621 4621SW 4622SW 4625SW 4630 4630SW 5410 5420 5610 5620 5621 6416D+M, 6424D+M, 9404, 9406, 9408, 9504, 9508.
Use this HIC-1 cord to connect Plantronics-qd headset directly to your telephone headset port, not need amplifier. This provides you with "on-hook" functionality so that you won't have to lift your telephone handset off the receiver for every call when using your headset.
Connecting a Headset to the HIC-1 cable adapter with quick connect QD, plug the headset QD into the HIC-1, one from headset and another from cable as image.
Installation, connect the modular plug to headset port of your telephone. If your phone has no headset port, disconnect the handset cord from phone and connect HIC-1 into handset port.
Make a call, dial tone is given when you press a button on the phone. Adjust volume to headset by adjusting the handset volume control on the phone.