CONNECTION TYPE : Connects to and works with ALL Plantronics and VoiceJoy QD Headsets, alternative to Plantronics U10 Adapter 26716-01 cable, Quick Disconnect to RJ9/RJ11 connection and works with all phones listed below, If your phone type or model is not listed please contact us before purchasing. | ONLY Compatible with Plantronics M10, M12, M22 & MX10 Amplifiers or CISCO IP phone models : CTS 500 Cisco IP 6921, 6941, 6945, 6961, 7821, 7841, 7861 Cisco IP 7931G, 7940, 7940G, 7941, 7941G, 7942, 7942G, 7945, 7945G Cisco IP 7960, 7960G, 7961, 7961G, 7962, 7962G, 7965, 7965G Cisco IP 7970, 7970G, 7971, 7971G, 7975, 7975G Cisco IP 8811, 8841, 8851, 8861, 8941, 8945, 8961, 9951, 9971 | ONLY WORKS FOR SOME SPECIFIC PHONE MODELS LISTED ABOVE. Not compatible with Cisco Spa phone series. For other phones, pls contact us for Compatibility Guide or Advice. | NOT FOR Jabra GN headsets as the photo shows. | COMPARE with Plantronics Cisco Cable 26716-01 cord