My boss received a call from this number. I told them he was in a meeting which is a standard answer for AA's who screen their boss' calls. She said she would call back. I told her my boss does not answer the phone, so how could I help her, she hung up. I called the number back and I was told it was a switchboard with many companies using the number and they would not have any way of tracking who had called.

Man wanted a specific IT manager, claiming to be “running a regression.”  I started the screening process, and he reacted irritably, "You ask me these questions every time I call.”  (Really?  When was the last time?  This is the first to my knowledge.)
I explained the company's policy, and he said, sounding frustrated, “I’ll find another way around it,” and hung up.

Chloe Miller from Hughes claimed that a specific Marketing manager would be joining her on a conference call.  Extracting information from her was like pulling teeth, and she was beginning to sound exasperated.  I asked her to wait a moment, and she started making strange noises; couldn't tell if she were snickering in amusement or humphing in frustration.  I put her on hold to check with the manager, and she hung up.