How do you know if you missed a call on Skype?

Skype

You will get a message from them asking permission to add them.

And if you have the app Skype on your itouch, then once you add someone there will be a white question mark and if they say yes to your friend request, then istead of a white question mark, then there will be a white X! And if there online then there will be a green check! And if they say no to your friend request then the white question mark will remain the same