Avaya, Bluetooth and Computer Wireless Headset Work with Avaya 2420, 4620, 5420, 5620, 5625 Desk Phone
Vxi EHS A2 Adapter #203930 for Avaya IP Phones: 1400,1608, 1616, 2400, 6400, 9608, 9611, 9620, 9620L, 9630, 9640, 9640G, 9641G, 9650, 9670, as well as for the 9500 series IP phones and 96x1 series desk phones.
Avaya Bluetooth Adapter For 9600 Series (700383789) – Atlas Phones
Avaya Bluetooth Adapter for 9600 Series (700383789) SBTA920A
Plantronics HIS Headset Cable | For Avaya 1600 and 9600 series phones, 72442-41
Avaya 9608 IP Telephone Text Version (700480585) - Shop4Tele
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