Sennheiser CAVA 31 Headset Cable for Avaya 1600 & 9600 Series Phones Easy Disconnect to modular plug, coiled cord. For connection to the Avaya 1600 Series phones Suitable for DW Office, DW Office ml, DW Office Phone, DW Pro 1, DW Pro 1 ml, DW Pro 1 Phone, DW Pro 2, DW Pro 2 ml, DW Pro 2 Phone, SD Office, SD Office ml, SD Pro 1, SD Pro 1