Melco's HIS adapter cord connects directly to the headset port on Avaya 1600 and 9600 IP phones. It includes Quick Disconnect (QD) capability that allows your headset to detach without losing your call. Equivalent to for Plantronics HIS-1 cable: PL-72442-41. Compatible with Avaya 9610, 9620, 9620L, 9620C, 9630, 9630G, 9640, 9640G, 9650, and 9650C IP phones. Also compatible with Avaya 1608, 1608-I, 1616, and 1616-I IP phones.