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How do I test E911 service?

Do you need to test e911 services with Telnyx. It's easy, just follow these simple instructions.

Telnyx Sales avatar
Written by Telnyx Sales
Updated over a week ago

Testing E911 Services with Telnyx: A Guide

Please note: Not registering an address or enabling emergency services for numbers used for emergency calls will result in those calls being considered unregistered, incurring a $100 penalty.

How to test emergency calls through 933?

To test the E911 service via Telnyx, simply dial 933 from a phone connected to Telnyx using your SIP Connection. This dedicated testing service will confirm the address you have registered for emergency calls.


Remember, emergency calls to 911 from a number with either an invalid Caller ID (CLI) or without a registered emergency address are deemed unregistered, leading to a $100 charge.

Invalid Caller ID

When setting up your Caller ID in the SIP headers from your device, ensure it follows the +E.164 format in your SIP INVITE to the Telnyx network. It's crucial to include both the '+' sign and the country code.

Caller IDs have a hierarchy of preference:

1. P-Preferred-Identity User

2. P-Asserted-Identity User

3. Remote-Party-Id User

4. From User

For instance, if your SIP INVITE only includes the 'From' header like this:

From: <>;tag=as388401f8

and you dial 933, the emergency address won't be correctly relayed since the number lacks the required '+' exit code. This rule applies to all caller ID headers; they must contain the '+' sign to be valid in the +E.164 format.

Correct Format

From: <>;tag=as388401f8


  • Currently, the 933 testing service is available exclusively in the United States and Canada.

  • For international numbers, emergency call testing may not be allowed. To check availability of emergency services and testing options for international numbers, email

    • Review this article for supported emergency numbers.

  • In the event of a 933 call, dispatchers are not provided with the business name, as this call primarily serves for address confirmation purposes. However, this doesn't indicate any oversight in provisioning the business name along with the address.
    In case of a subsequent call to 911, complete information including the business name and address will be provided.

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