Keeps calling, rings 3 times then hangs up.  Caller ID only says "Out of Area".  Appears to be VoIP from the Huntsville, AL, area.  Call back and you hear music to being with.  Then someone picks up and in an accent gives the name of some sort of financial group, asks if you are calling in response to a letter or a missed call.  Will not give any additional information or state who they are looking for.