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Emergency Calling for SIP Interfaces API


Twilio's Emergency Calling for SIP API enables emergency call routing to Public Safety Answering Points (PSAPs) in the US, Canada, and the UK.

Emergency addresses are registered on a per phone number basis. This page outlines the process you should follow to register emergency addresses and enable or disable emergency calling using Programmable Voice SIP Interfaces. Please ensure that you also read our emergency calling documentation.

Phone numbers are managed through the core Twilio REST API. Check out the IncomingPhoneNumber resource documentation for more information.


Register an Emergency Address on a Twilio Number

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  • Create and validate a new Emergency Address.
  • Associate an Emergency Address with a Twilio number.
  • Check Emergency Calling Address Status on a Twilio number to ensure it's registered.
  • Enable Emergency Calling on a SIP Domain.

Delete Emergency Address on a Twilio Number

delete-address page anchor
  • Set Emergency Address to Null.
  • Check Emergency Address Status on a Twilio number to ensure it's unregistered.
  • Disable Emergency Calling on a SIP Domain.

Changing the Emergency Address on a Twilio Number

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  • Dis-associate the Emergency Address from your Twilio Number.
  • Check Emergency Address Status on a Twilio number to ensure it's unregistered.
  • Associate new Emergency Address with Twilio Number.
  • Check Emergency Address Status on a Twilio number to ensure it's registered.

  • Set Emergency Enabled Twilio Phone Number as Emergency Caller ID.

Create and validate a new Emergency Address

create-and-validate-a-new-emergency-address page anchor

post

https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/Addresses

Create a new Address and validate it for Emergency Calling by setting the EmergencyEnabled parameter to true.

Create and validate a new Emergency Address

create-and-validate-a-new-emergency-address-1 page anchor

Ensure to set EmergencyEnabled to True

Node.js
Python
C#
Java
Go
PHP
Ruby
twilio-cli
curl

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// Download the helper library from https://www.twilio.com/docs/node/install
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// Find your Account SID and Auth Token at twilio.com/console
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// and set the environment variables. See http://twil.io/secure
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const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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client.addresses
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.create({
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friendlyName: 'Twilio',
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emergencyEnabled: true,
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customerName: 'Twilio',
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street: '645 Harrison St.',
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city: 'San Francisco',
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region: 'CA',
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postalCode: '94105',
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isoCountry: 'US'
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})
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.then(address => console.log(address.sid));

Output

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{
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"city": "San Francisco",
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"customer_name": "Twilio",
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"date_created": "Tue, 18 Aug 2015 17:07:30 +0000",
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"date_updated": "Tue, 18 Aug 2015 17:07:30 +0000",
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"emergency_enabled": true,
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"friendly_name": "Twilio",
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"iso_country": "US",
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"postal_code": "94105",
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"region": "CA",
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"sid": "ADXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"street": "645 Harrison St.",
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"street_secondary": null,
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"validated": false,
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"verified": false,
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Addresses/ADXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.json"
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}

Example Response(s)
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A new address might be suggested as part of the validation process:


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<?xml version='1.0' encoding='UTF-8'?>
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<TwilioResponse>
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<RestException>
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<Code>21629</Code>
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<Message>Failed to validate address. Check the suggested address. | FriendlyName: Twilio, CustomerName: Twilio, Street: 645 HARRISON ST, Locality: SAN FRANCISCO, Region: CA, PostalCode: 94105, IsoCountry: US</Message>
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<MoreInfo>https://www.twilio.com/docs/errors/21629</MoreInfo>
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<Status>400</Status>
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</RestException>
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</TwilioResponse>
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}

Associate an Emergency Address with a Twilio number

associate-an-emergency-address-with-a-twilio-number page anchor

post

https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/IncomingPhoneNumbers/{PhoneNumberSid}

Associate an Emergency Address with a Twilio Number

associate-an-emergency-address-with-a-twilio-number-1 page anchor
Node.js
Python
C#
Java
Go
PHP
Ruby
twilio-cli
curl

_10
// Download the helper library from https://www.twilio.com/docs/node/install
_10
// Find your Account SID and Auth Token at twilio.com/console
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// and set the environment variables. See http://twil.io/secure
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const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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client.incomingPhoneNumbers('PNXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX')
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.update({emergencyAddressSid: 'ADXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'})
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.then(incoming_phone_number => console.log(incoming_phone_number.friendlyName));

Output

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{
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"address_requirements": "none",
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"address_sid": "ADXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"api_version": "2010-04-01",
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"beta": false,
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"capabilities": {
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"voice": true,
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"sms": false,
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"mms": true,
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"fax": false
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},
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"date_created": "Thu, 30 Jul 2015 23:19:04 +0000",
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"date_updated": "Thu, 30 Jul 2015 23:19:04 +0000",
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"emergency_status": "Inactive",
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"emergency_address_sid": "ADXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"emergency_address_status": "registered",
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"friendly_name": "(808) 925-5327",
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"identity_sid": "RIXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"origin": "origin",
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"phone_number": "+18089255327",
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"sid": "PNXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"sms_application_sid": "",
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"sms_fallback_method": "POST",
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"sms_fallback_url": "",
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"sms_method": "POST",
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"sms_url": "",
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"status_callback": "",
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"status_callback_method": "POST",
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"trunk_sid": null,
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/IncomingPhoneNumbers/PNXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.json",
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"voice_application_sid": "",
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"voice_caller_id_lookup": true,
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"voice_fallback_method": "POST",
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"voice_fallback_url": null,
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"voice_method": "POST",
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"voice_url": null,
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"voice_receive_mode": "voice",
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"status": "in-use",
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"bundle_sid": "BUXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
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}

(information)

Info

You can disassociate an Emergency Address by updating the the emergency_address_sid to null (or undefined, None or nil depending on your programming language).

For curl leave the right side of the = blank:


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curl -X POST https://api.twilio.com/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/IncomingPhoneNumbers/PNXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.json \
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--data-urlencode "EmergencyAddressSid=" \
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-u ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:your_auth_token

Check Emergency Calling Status on a Twilio number

check-emergency-calling-status-on-a-twilio-number page anchor

get

https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/IncomingPhoneNumbers/{PhoneNumberSid}

Check Emergency Calling Status on a Twilio number

check-emergency-calling-status-on-a-twilio-number-1 page anchor
Node.js
Python
C#
Java
Go
PHP
Ruby
twilio-cli
curl

_10
// Download the helper library from https://www.twilio.com/docs/node/install
_10
// Find your Account SID and Auth Token at twilio.com/console
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// and set the environment variables. See http://twil.io/secure
_10
const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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client.incomingPhoneNumbers('PNXXXXXXXXXXXXXXXXXXX')
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.fetch()
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.then(incoming_phone_number => console.log(incoming_phone_number.friendlyName));

Output

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{
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"address_requirements": "none",
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"address_sid": "ADXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"api_version": "2010-04-01",
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"beta": false,
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"capabilities": {
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"voice": true,
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"sms": false,
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"mms": true,
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"fax": false
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},
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"date_created": "Thu, 30 Jul 2015 23:19:04 +0000",
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"date_updated": "Thu, 30 Jul 2015 23:19:04 +0000",
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"emergency_status": "Active",
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"emergency_address_sid": "ADXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"emergency_address_status": "registered",
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"friendly_name": "(808) 925-5327",
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"identity_sid": "RIXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"origin": "origin",
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"phone_number": "+18089255327",
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"sid": "PNXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"sms_application_sid": "",
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"sms_fallback_method": "POST",
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"sms_fallback_url": "",
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"sms_method": "POST",
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"sms_url": "",
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"status_callback": "",
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"status_callback_method": "POST",
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"trunk_sid": null,
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/IncomingPhoneNumbers/PNXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.json",
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"voice_application_sid": "",
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"voice_caller_id_lookup": false,
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"voice_fallback_method": "POST",
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"voice_fallback_url": null,
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"voice_method": "POST",
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"voice_url": null,
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"voice_receive_mode": "voice",
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"status": "in-use",
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"bundle_sid": "BUXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
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}

Delete an Emergency Address

delete-an-emergency-address page anchor

delete

https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/Addresses/{AddressSid}

Node.js
Python
C#
Java
Go
PHP
Ruby
twilio-cli
curl

_10
// Download the helper library from https://www.twilio.com/docs/node/install
_10
// Find your Account SID and Auth Token at twilio.com/console
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// and set the environment variables. See http://twil.io/secure
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const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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client.incomingPhoneNumbers('ADXXXXXXXXXXXXXXXXXX').remove();


Enable and Disable Emergency Calling on SIP Domain

enable-and-disable-emergency-calling-on-sip-domain page anchor

post

https://api.twilio.com/2010-04-01/Accounts/{AccountSid}/SIP/Domains/{SipDomainSid}

Enable Emergency Calling on a SIP Domain

enable-emergency-calling-on-a-sip-domain page anchor
Node.js
Python
C#
Java
Go
PHP
Ruby
twilio-cli
curl

_10
// Download the helper library from https://www.twilio.com/docs/node/install
_10
// Find your Account SID and Auth Token at twilio.com/console
_10
// and set the environment variables. See http://twil.io/secure
_10
const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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client.sip.domains('SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX')
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.update({emergencyCallingEnabled: true})
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.then(domain => console.log(domain.domainName));

Output

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{
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"api_version": "2010-04-01",
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"auth_type": "IP_ACL",
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"date_created": "Mon, 20 Jul 2015 17:27:10 +0000",
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"date_updated": "Mon, 20 Jul 2015 17:27:10 +0000",
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"domain_name": "dunder-mifflin-scranton.sip.twilio.com",
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"friendly_name": "Scranton Office",
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"sip_registration": true,
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"sid": "SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"subresource_uris": {
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"credential_list_mappings": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/SIP/Domains/SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/CredentialListMappings.json",
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"ip_access_control_list_mappings": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/SIP/Domains/SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/IpAccessControlListMappings.json"
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},
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/SIP/Domains/SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.json",
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"voice_fallback_method": "POST",
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"voice_fallback_url": null,
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"voice_method": "POST",
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"voice_status_callback_method": "POST",
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"voice_status_callback_url": null,
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"voice_url": "https://dundermifflin.example.com/twilio/app.php",
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"emergency_calling_enabled": true,
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"secure": true,
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"byoc_trunk_sid": "BYXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"emergency_caller_sid": "PNXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
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}

Disable Emergency Calling on a SIP Domain

disable-emergency-calling-on-a-sip-domain page anchor
Node.js
Python
C#
Java
Go
PHP
Ruby
twilio-cli
curl

_10
// Download the helper library from https://www.twilio.com/docs/node/install
_10
// Find your Account SID and Auth Token at twilio.com/console
_10
// and set the environment variables. See http://twil.io/secure
_10
const accountSid = process.env.TWILIO_ACCOUNT_SID;
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const authToken = process.env.TWILIO_AUTH_TOKEN;
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const client = require('twilio')(accountSid, authToken);
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client.sip.domains('SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX')
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.update({emergencyCallingEnabled: })
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.then(domain => console.log(domain.domainName));

Output

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{
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"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"api_version": "2010-04-01",
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"auth_type": "IP_ACL",
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"date_created": "Mon, 20 Jul 2015 17:27:10 +0000",
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"date_updated": "Mon, 20 Jul 2015 17:27:10 +0000",
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"domain_name": "dunder-mifflin-scranton.sip.twilio.com",
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"friendly_name": "Scranton Office",
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"sip_registration": true,
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"sid": "SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"subresource_uris": {
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"credential_list_mappings": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/SIP/Domains/SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/CredentialListMappings.json",
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"ip_access_control_list_mappings": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/SIP/Domains/SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/IpAccessControlListMappings.json"
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},
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"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/SIP/Domains/SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.json",
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"voice_fallback_method": "POST",
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"voice_fallback_url": null,
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"voice_method": "POST",
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"voice_status_callback_method": "POST",
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"voice_status_callback_url": null,
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"voice_url": "https://dundermifflin.example.com/twilio/app.php",
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"emergency_calling_enabled": ,
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"secure": true,
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"byoc_trunk_sid": "BYXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"emergency_caller_sid": "PNXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
_26
}

Phone Number SID of an emergency address registered Twilio phone number. If present, this phone number will be used as the callback for the emergency call.

Node.js
Python
C#
Java
Go
PHP
Ruby
twilio-cli
curl

_10
// Download the helper library from https://www.twilio.com/docs/node/install
_10
// Find your Account SID and Auth Token at twilio.com/console
_10
// and set the environment variables. See http://twil.io/secure
_10
const accountSid = process.env.TWILIO_ACCOUNT_SID;
_10
const authToken = process.env.TWILIO_AUTH_TOKEN;
_10
const client = require('twilio')(accountSid, authToken);
_10
_10
client.sip.domains('SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX')
_10
.update({emergencyCallerSid: 'PNXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'})
_10
.then(domain => console.log(domain.domainName));

Output

_26
{
_26
"account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"api_version": "2010-04-01",
_26
"auth_type": "IP_ACL",
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"date_created": "Mon, 20 Jul 2015 17:27:10 +0000",
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"date_updated": "Mon, 20 Jul 2015 17:27:10 +0000",
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"domain_name": "dunder-mifflin-scranton.sip.twilio.com",
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"friendly_name": "Scranton Office",
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"sip_registration": true,
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"sid": "SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
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"subresource_uris": {
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"credential_list_mappings": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/SIP/Domains/SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/CredentialListMappings.json",
_26
"ip_access_control_list_mappings": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/SIP/Domains/SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/IpAccessControlListMappings.json"
_26
},
_26
"uri": "/2010-04-01/Accounts/ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/SIP/Domains/SDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.json",
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"voice_fallback_method": "POST",
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"voice_fallback_url": null,
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"voice_method": "POST",
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"voice_status_callback_method": "POST",
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"voice_status_callback_url": null,
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"voice_url": "https://dundermifflin.example.com/twilio/app.php",
_26
"emergency_calling_enabled": true,
_26
"secure": true,
_26
"byoc_trunk_sid": "BYXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
_26
"emergency_caller_sid": "PNXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
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}


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