Amazon.com: Avaya Headset HD Voice with HIS Adapter Compatible with Avaya 1600, 9600, J100 Series IP Phones Model, Plus 3.5mm Adapter (Monaural) : Electronics
Jabra Biz 1500 Duo Avaya 1400 2400 4600 5600 9400 9500 Certified Headset
Avaya L149 - is a mid-range and binaural headset with flexibility