I repeatedly get calls from this number, a few a week. The CID shows "William Kilgore". An internet search on the number comes up with nothing really, just that it's in Pasadena, CA.  A search on the name came up with several hits so it's hard to say, but there is one William Kilgore (also goes by Bill) in the area that sells insurance.

I'm gonna guess this is the guy and he's cold calling.  

Never leaves a message.