Skyping between iPad and Windows Phone 8

One of the reasons I moved up to a smartphone with front-facing camera was so I could Skype with my dad, allowing him to see our preschooler more often.  But after many attempts trying to use my Windows Phone 8 device to "phone" his iPad, I was almost ready to give up.  On the iPad, no incoming call was being detected. 

I was going to resort to Google Hangouts and using my wife's Android phone.  Google Hangouts required a iOS upgrade, so I updated my dad's 3rd generation iPad to iOS 7.0.2 and in the process, I updated Skype as well on the Apple device. Before heading home, I decided to try Skype once more and eureka, video-conferencing finally worked! 

Now the challenge is to get my dad to learn a couple of steps and try Skyping with me when we are at two different locations and I can't directly assist him.