Same as RG - called but left no message, but added them to my phone's blocked call list. Based on another site's 2011 details on this number, it appears to be an unscrupulous collection agency trying to collect monies on alleged debt or payday loan collection. They disguise themselves as police or sheriff deputies ("Officer Mason calling from ... ") calling about an upcoming court appearance dealing with debt collection. The "Officer Mason" may claim to be calling about a debt owed by you, your spouse, child or sibling. [Pretty all inclusive, huh?]
See this thread for details: http://800notes.com/Phone.aspx/1-408-385-6956.
I got calls everyday for last two months. I called them today and lady told that these calls are for Homeless Veterans Fund. Is this legitimate? Looks like funds raising organization for many causes. Hmm.