Compatible with CISCO phone 68xx, 78xx, 88xx, 89xx, 99xx series model (it has a RJ9 headset jack) and partial 69xx and 79xx phone model. 6941 6945 6961 7931G 7940 7940G 7941 7941G 7942 7942G 7945 7945G 7960 7960G 7961 7961G 7962 7962G 7965 7965G 7970 7970G 7971 7971G 7975 7975G.
