Skype Phone not receiving Calls on Skype Number

I pay for a skype landline number. I use a skype dualphone and a Skype Belkin desktop phone to receive calls and both worked fine until recently, and now neither will receive calls to my skype landline number although I can ring out ok. They both have a strange symbol showing on the screens - a horizontal handset and an arrow above coming towards the handset and then going away. I have checked the settings and do not have call forwarding or call divert activated. Software is up to date. Any ideas of what is causing the problem or how to fix it?

Thanks