✅ Wired VoIP Cisco Headset compatible CP- 9971 7945 7942 7941 7940 7962 7961 7960 7925 7911 8841 7841 7821 7965 8865 8851 8845 8841 8811 8945 6941 6921 ✅ Wired Noise Cancelling Avaya Headset compatible models: 9608 9608g 9611 9611g 9620 9621g 9630g 9641 9641g 9650 9650c 9600 1608-i 1608-i 1616 1616-i 9504 9508 5410 5420 2410 2420 6408d+ 8410d 1416 1408 partner 18d ✅ Wired IP Yealink Headset compatible SIP phone models T21p, T21p e2, T22p, T23g, T23p, T29g, T41p, T41s, T42g, T46, T46g, T46s, T48g. Grandstream headset for GXP2170, GXP2160, GXP2140, GXP2135, GXP2130, GXP2124, GXP2120, GXP2110, GXP2100, GXP2020, GXP2010, GXP1450, GXP1200, GXP1400, GXP1405, GXP1610, GXP1615, GXP1620, GXP1625, GXP1628, GXP1760, GXP1780 & GXP1782