One thing that's missing here is video camera feed. As an interviewer, I don't turn on my webcam and I don't expect the candidate to do it (although they can if they want to). However, I've heard different people have different opinions on this. It's definitely something that could go on this list for phone interviews.

Of course, intra-US interviews are usually done over the phone but when the interviews are across countries, tools such as Google Hangouts are normally used.