Telephone job interviews are usually outsourced to a call center, but even so it’s always a good idea to not be a jerk when you call!
When I launched into the actual interview, it really pissed them off. They’d get furious that the freaking receptionist had the audacity to waste their time by … And then round about question 5 it would dawn on them that this was the interview. I could hear the quick catch in their speech as it hit them, and the sick pause as they thought back over how they’d been behaving for the past several minutes.