Called our land line today which is on state and federal DNC.  Left no message.  Caller ID showed "Texas".  I doubt if this is a valid phone number (surprise).  It is interesting to note that exactly 15 minutes later we got another call with the caller ID displaying "Texas", but this time the phone number showed to be 972-492-3122.  Coincidence??  Maybe, maybe not.  Internet search indicates the second number is used by what appears to be an adaption center in the Denton, TX area.