I am using the 3CX MyPhone softclient and login succesfully using the correct Extension Number and PIN. I can see my status as available. The extnesion status will show "Not Registered" When I tried calling another extension I always get this message pop up "Your extension is not registered with 3CX Phone System so calls cannot be made. Make sure your extension is registered and try again" I am using the free 3CX PBX. Any help as to how I can call another extension?