Got a call this afternoon from this number, and the caller ID showed AMERICAN CORADI as the caller.  Of course, no message was left.  A Google search came up with American Coradius International.  They appear to be a pretty unscrupulous 3rd-party debt collector.  Many reviews state that these people very rarely follow the law and will use whatever tactics they want to intimidate and scare the people they're calling.  I never answer calls from numbers I'm not familiar with, but now I know I will never answer a call from these people.

Unknown number. Called At dinner time. Left no message.