WORKS with Avaya IP 1608, 1616, 9601, 9608, 9610, 9611, 9611G, 9620, 9620C, 9620L, 9621, 9630, 9630G, 9640, 9640G, 9641, 9641G, 9650, 9650C, 9650G, 9670. Compare to Plantronics H series Headset + Plantronics HIS cord.
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