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This amazing adapter converts the standard phone headset 2.5mm plug to an RJ9, RJ10, or RJ22 headset plug, allowing you to use your favorite 2.5mm headset with your office VOIP phone. Does not work with RJ11 jack, which is wider than your handset or headset jack (6 positions vs. 4). RJ11 jack is what is in the wall. RJ9, RJ10, RJ22 are what is on your phone handset or headset. ONLY BUY THE ITEM TODAY IF YOU HAVE ONE OF THE PHONE MODELS LISTED BELOW. Works for Phones: Plantronics Amplifier: M10, M12, M22 & MX10 Vista Modular Adapters Cisco IP Phones: 7931G, 7940, 7940G, 7941, 7941G, 7942, 7942G, 7945, 7945G, 7960, 7960G, 7961, 7961G, 7962, 7962G, 7965, 7965G, 7970, 7970G, 7971, 7971G, 7975, 7975G 6921, 6941, 6945, 6961, 7821, 7841, 7861 8811 8841 8851 8861 8941, 8945, 8961, 9951, 9971