California location, but I'm in Texas. This number has called several times in thirty minute intervals and hasn't left a voicemail. No idea who it is or what they want, all I know is I'm not answering (especially since I can't because I'm at work!).
According to one site I found, the number belongs to a medical monitoring device company called Kostec Corporation out of Korea. This is their US affiliate number. Here's the web site: