The EE HD handsets are not synchronising with the router. I try and answer an incoming call and there is nothing, the line is open and the caller cannot hear anything either. I have tried calling out and there is no line signal and again nothing happens. I have tried re-syncing the handsets but nothing happens. The old landline handsets do seem to be working but they are plugged into the router. Any suggestions? We have some health issues and need a reliable phone connection.
