VoiceJoy Headset Adapter Cable 3.5mm Smartphone Headset to RJ9/RJ10 Phone Adapter for ONLY Cisco 7940 7970 7960 00 8900 Series Phones

ONLY WORKS with Plantronics M10, M12, M22 & MX10 Amplifiers or CISCO IP phone models : Cisco IP 21, 41, 45, 61, 7821, 7841, 7861 Cisco IP 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 or AVAYA CALLMASTER V VI ONLY COMPATIBLE FOR SOME SPECIFIC PHONE MODELS LISTED ABOVE.Not compatible with Cisco Spa phone series.'