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I'm going to have an interview a few days from now (phone-based), but I have not given the information about the interview structure which I was supposed to receive via email. I called back the number who had contacted me but I reached a voicemail and my voice message has not been replied yet.
Generally, I'd like to know if it is a technical interview or an HR Q&A session and the job title of the people who will be interviewing me. But, I'm not sure if it is assumed common if an applicant calls the company asking for the HR department to investigate such information? or they'd be annoyed and this might reflect badly on their impression about me?