I am using wireless headset GN9120 with GN1000 lifter. It looks like as soon as the lifter lifts the handset the headset port on the IP Phone (7971) goes off. I can hear the other end very well but they can't hear me. I called Jabra's support, they told me that I need to configure the IP phone in order to activate the headset phone button once the lifter goes on and released. The gentleman at Jabra told me that they had the same problem but someone from Cisco configured the IP Phones headset button and it's working fine since. He is using an Cisco IP phone 7940. I don't see where I can configure this option. Could you please let me know if there's any configuration to make this option work. My customer is kind of frustrated because this option used to work very well with their old Avaya PBX and phones.