Use this quick disconnect ( QD ) cord to connect any headset directly to your telephone headset port. Quick Disconnect (QD) capability allows the headset to detach without losing the call, you won't have to lift your telephone handset off the receiver for every call when using your headset. Purchase this cable if you have one of the phone models listed below.
Compatible (WORKS with Plantronics M10, M12, M22 & MX10 Amplifiers or CISCO IP phone models ):
Cisco IP 6921, 6941, 6945, 6961, 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, 9971I

CISCO Cable that connect any Plantronics H & HW series headset with most Cisco 6900, 7800, 7900, 8900, 9900 series IP phone (as long as it has a RJ9 modular Headset Jack)