NPSTN now has an Emergency 911 Operator Service (known as the VED, Volunteer Emergency Dispatch).
When you dial 911 on NPSTN (not currently working on NA01) it will go to the VED Direct number (248-9110)
This number will play a recording explaining the number is not an emergency number, and if you stay on the line, you will get transferred to an emergency operator. This should work for most peoples switches because it has been changed in the route table.
Remember, NPSTN 911 is not for REAL emergency calls, but in the case of an actual emergency we can try our best to provide emergency services by bridging in 911.
https://youtu.be/Lt04SLIJfS4