4Call K163CM Mono Call Center Telephone RJ Headset with Noise Canceling Microphone for Plantronics M10 M22 Vista Adapter and AT and T CallMaster V VI and Cisco Unified Office IP Phones 7931G 7975

Call Center Telephone RJ Headset with Noise Canceling Microphone for Plantronics M10 M22 Vista Adapter and AT&T CallMaster V VI & Cisco Unified Office IP Phones 7931G 7975. COMPATIBLE PHONE LIST: BUY ONLY WHEN YOU HAVE ONE OF THE PHONES LISTED BELOW 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 AT&T, Lucent, Avaya Definity : "Call Master V" and "Call Master VI"