I gota a call from this number, and they knew my first name but did not know my last name, and hung up saying they got the wrong person.  Weird The number showed up from Denver CO

An American woman asked to talk to a particular IT manager.  She claimed to be calling for her supervisor but wasn't privy to the reason behind it.  I said that because managers’ calls must be screened, I couldn't make the transfer without knowing its purpose.  Normally, these inquiries end with the person saying they'll find out and phone back but never do.  In this case, she just said Thank You and hung up.

Received call from this number at 6am. No message left when let it go to voice mail.

Ignores the donotcall.gov database.

Received call from this number at 11:20am. No message left when let it go to voice mail.