I am trying to get a Jabra headset to work with a Yealink EHS36 electronic hook switch and Yealink T28P phone. I can talk and hear, but the phone will not hang up or answer. I do hear a click in the EHS when I press the call end button on the headset, but the phone does not pick up or hangup. I used the same EHS36 and phone to hook up a Plantronics CS55 and it worked great. I am on firmware 220.127.116.11 which is the latest posted. Any suggestions?