Headset Adapter Cable (Alternative to Plantronics U10) - Compatible with Plantronics or MKJ QD Headsets
RJ9 Headset Adapter Compatibility: (Included but not Limited)
Cisco IP Phones:Cisco 6921, 6941, 6945, 6961, 7821, 7841, 7861, 7931G, 7940, 7940G, 7941, 7941G, 7942G, 7945, 7945G, 7960, 7960G, 7961, 7961G, 7962G, 7965G, 7970, 7970G, 7971G, 7975G, 7985G, 8811, 8841, 8845, 8851, 8861, 8865 and 8900, 8941, 8945, 8961, 9951, 9971
Note: This RJ9 Cord ONLY Compatible with Cisco Phones with RJ9 Headset Jack!