Video in Skype options but not in Skype

I have installed Skype in accordance with instructions elsewhere and Options>Video devices shows the webcam working perfectly but, when I call someone, the Video icon is greyed out and does not show video.

I saw in another thread that the video icon only became active when someone answered a call but, so far, I have no been able to find anyone in to answer a call and check this out.

Can anyone either confirm the second sentence or give advice on the first?

I have now discovered that this is normal in the Linux version but different in the Windows version - which gave rise to the question.

Well the Windows and Linux version are different.