Update: back up and running at around 4:10 p.m.
You may have just gotten a CodeRED call about this. Via OC:
This is an alert from Orange County Emergency Services. 9-1-1 telephone service is down across Orange County.
The workaround phone number for 9-1-1 emergency calls in Orange County is 919 732 5856.
A CodeRED message has also been sent to impacted residents.