Salaams,
let me share this with you:
Here in Canada to pursue your PhD, as step 1 you have to establish a contact with supervisor has same interest in your research area, for example if I am interested in wireless communications certain topic in this field, so I will look at supervisor published papers and his or her work research area
this is the procedure, usually supervisor will ask you to send him/her your transcript, resume, summary of interest research area.. etc, in order to accept you. Upon agreement, supervisor will send a request to admission office that as long you are meeting department admission requirements, he/she is accepting you as PhD Candidate. My recommendation you should have a vision why you want to pursue PhD degree, prepare your area of interest,.
You may find many supervisors within the department but the challenge how to hook up with a very good one, because good supervisor sometimes has industrial research fund, and vice versa good supervisor will always pick an intelligent student and has a vision.