WebRTC client can only make calls. Not receiving any.

Hi guys.

I am rather new to doing VOIP over WebRTC. So be easy on me.

I have CTXsip running in the browser. I have a PortSIP SBC running on AWS acting as the WebRTC WebSocket gateway.

I can connect and register the phone to the Asterisk based PBX in the cloud. However as the title states the calls are only going one way - Out and not in.

Any help will be much appreciated.