Why can't I contact another Apple FaceTime user?
I am trying - and failing! - to FaceTime a contact who I know uses FaceTime on his iPad to make video calls to his son in Australia. When I open my FaceTime (Ver 3.0) on my iMac (OS X Yosemite Ver. 10.10.4) I click in the 'Enter a name, email, or number' field and type in their name as it appears in my Contacts. The correct contact appears below, I double-click on the name and FaceTime tells me the contact "is not available for FaceTime".
My friend has tried to FaceTime me and has the same problem.
I have used FaceTime successfully many times so I would be grateful if someone could tell me what I am doing wrong in this case. Thank you!
iMac, OS X Yosemite (10.10.4)