Just got a text to landline message from this number.  The message was not audible so no info there.  This occurred at about 11:30 pm central.  Here's a intelius link:

http://www.intelius.com/results.php?ReportType=33&searchform=

Twice prior to this call and once after, in the span of about 5 minutes, I received 'private caller' calls.  I have no idea if they were placed by 417-693-4421.