Nurse Recruiter Missed Phone Interview...?

A little background info: I'm a new grad RN (JUST passed my NCLEX a few days ago), and like all other new grads, am having a lot of trouble finding a job in this tough market. Thankfully, I recently secured a phone interview at a great academic hospital in the maternal-child unit.
The problem: I had a phone interview scheduled with a Nurse Recruiter for 11AM today, it's now 12:30PM and still no call. I've rechecked the date, the time, the recruiter's phone number, etc. Everything should be in order. I've even called the recruiter's office directly every 15 minutes since 11AM but to no avail (just voicemail).

What should I do?? Should I keep calling? Send an email?
I was so excited and ready for this interview...

Any suggestions would be greatly appreciated!
Thanks!