If you are having trouble receiving Skype and International Calls, here's what you should do:
Disable the Advanced Robocall Detection feature.
To do this, log into your Nomorobo Account and click "Your Phones." Click ‘Edit’ next to your phone number. Click the checkbox to ‘Disable advanced robocall detection.’
By disabling this, your phone will still be protected from the illegal robocallers, but these skype and international calls will get through as normal.