The company that has this number is called: Express Service.  They are telemarketing a HR Recruiting service franchise business opportunity to anyone who meets their criteria.  There is an investment involved and it appears to be a legitimate enterprise operating out of OK City.  When they called they did not leave a message and that was a negative for me, however, after returning the call it was handled professionally.

As Buzz says, they want you to buy into an Express Employment Pros franchise. There is no employment opportunity.

Someone from this number keeps calling and not leaving a message.  Caller ID says Express Service.  Just called this morning on Christmas Eve.  Total nuisance!