911 is not a trivial service that can be tested blindly.
Alternatively you can dial 911, inform the operator it is not an emergency but a test call, and have them verify the phone number and location.
Where I live (in Canada), one time I did some test using a VOIP application, I have no idea why or how, but it caused a call to 911 (I didn't even saw the call...). They called some minutes later to see if everything was alright and when I said it was probably my test using VOIP that caused that, they understood instantly, like it wasn't unusual.
If you terminate a PRI into your PBX, you can send whatever number identification you desire.
This is fun for mucking about with coworkers (why is my wife calling me from home in the middle of the day?!?) but serious business for 911 services. You get it right, and you test it by calling them. Identify clearly and immediately that this is not an emergency, but an ANI test and would they please verify that the originating number is xxxxx.
It's fully expected and might even be "required".
Regular Calling Line ID to your cell phone may be totally different that Calling Line ID (ANI) to the PSAP 911 center.