The Discover D712 headset bundle is tested and 100% compatible with your Avaya IP phone models: 1608, 1616, 9601, 9608, 9610, 9611, 9611G, 9620, 9620C, 9620L, 9621, 9630, 9640, 9640G, 9641, 9650, 9650C, 9670. The Discover D712 headset is a preferred headset for many office workers and call center agents who need the ability to keep both hands free to keep productivity up. In addition, all day comfort and crystal clear sound to hear and be heard is very important. The D712 provides you with an adjustable headband, swiveling speakers, leatherette ear cushions and foam for you to optimize your headset for a perfect fit! Also, dual speakers and an adjustable microphone ensures you can hear and be heard crystal clear with limited background distractions. Lastly, the Discover D712 headset is covered with a 3 year advanced replacement warranty for peace of mind!