I have recieved a missed call from this number, and when I returned the call it said they do not accept incoming calls. What is it?

This is a "Medical Appointment Reminder" line/number. This phone line is used by different medical providers to provide Computer Generated Medical Appointment Reminder Calls to people who have doctors appointments / lab work appointments, etc. that are coming up in the next few days. I received a call from this number - it was a recorded message reminding me that I have an appointment with my Primary Care Doctor on 03/29/2013. I got the call today, 03/27/2013, at 3 PM. This is a legitimate business making legitimate telephone calls. In my case, the medical appointment was originally made 6 months ago and I had forgotten about it. I would have missed the appointment had they not called to remind me of the appointment. If you get a call from this number then you either have an appointment with someone who uses this service to make their appointment reminder calls - or - someone mis-wrote their telephone number on the information sheet or it was misread by the human who typed it into the computer.

This number is a patient reminder line and does not accept incoming calls. That what was said to me when I called.