This RJ9 telephone headset only works for some Plantronics Amplifiers and Cisco IP phones (Please refer to compatible phone list below, If your phone model is not listed, please do not buy it and enquire for compatibility advice and guide.)
Compatible with Plantronics Amplifier: M10, M12, M22 & MX10 Vista Modular Adapters
Compatible with 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, 6821,6841, 6851, 6921, 6941, 6945, 6961, 7811, 7821, 7841, 7861, 8811, 8841, 8845, 8851, 8861, 8941, 8945, 8961, 9951, 9971
NOTE: Not compatible with Cisco Spa phone series. NOT for smartphones and computers directly.