Typically this department will call the people who are offered the job and sometimes those not getting it will get calls, sometimes not. Often they find out in a department wide email announcing who got the job.
How would you expect to receive the news if you were not chosen?
I'm asking out of curiosity because at this point it's just getting amusing with the speculation.
J/K, I would expect the hiring manager would call and let the candidate know that while they were qualified, there were applications that were a better fit.
I've worked at companies where they just never got back to people. At all. No calls or letters. Just let the candidate figure it out.