@Abdus Khan since you are applying for a MS/PhD, typical procedure would be as follows: you should have your professor of interest (POI) who will contact you to schedule an academic interview over skype (this is more about your academic background, you research experience and your personal interest on POI's research work, like why you want it and how can you contribute to the research). If everything goes smooth and he gives a positive feedback to admission committee regarding you, the committee will contact you via email to schedule a personal interview via skype (this one is a casual talk as I described earlier). After that it depends, some people get an invitation to a 3-rd personal interview or just get a final decision after some time. Hope everything will work out to all of us!