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Documents Required and Instructions to Register Your Alphanumeric Sender ID in Australia

Before we begin

Effective July 13, 2023, dynamic Alphanumeric Sender IDs won’t be allowed in Australia. All Alphanumeric Sender IDs must be pre-registered to send messages in Australia. Messages sent using Alphanumeric Sender IDs that aren’t pre-registered by July 13, 2023 may be blocked at this time. Twilio reserves the right to block customers who have not registered by the specified date; we may block customer traffic sooner if we receive notice from ACMA to do so.

This article outlines the documentation requirements for a pre-registration in Australia.

In 2022, the Australian Communications and Media Authority (ACMA) introduced the Scam Code. This Code outlines processes for identifying, tracing, and blocking disrupting scam calls and scam SMS.
To remain compliant with these industry-wide regulatory changes, Twilio is mandating pre-registration of Alphanumeric Sender IDs by July 13, 2023. This will help Twilio ensure that Australian consumers are safe from fraud and that messages are not blocked.



To register your Alphanumeric Sender ID, Twilio requires that you provide the following documents: 

  • Go to the Alphanumeric Sender ID registration form and choose Australia from the ‘Select a country’ dropdown. 
  • Upload a proof that you are entitled to use the Alphanumeric Sender ID in the form of a Business Registration License, examples of which include:
  • If you are registering the Sender ID for your own organization please complete the request for registration of Sender ID.
    • Letter for Direct Twilio Customers
  • If you’re registering the Sender ID on behalf of a third party, please ensure that you complete the request for sender ID registration for third parties.
    • Letters for Third Parties - "Registration of Sender IDs on Behalf of 3rd Parties (Version 2)"
      • Note: The previous version of the Third Party LOA will still be accepted, but we have streamlined the requirements into a new version linked below.
    • (Option for bulk): Sender ID ANNEX 1 Registration of Sender IDs - If you have too many Sender IDs, please use the excel file to fill in the list of Sender IDs in place of ANNEX 1.
    • **Make sure to also submit proof in the form of business licenses as described above.**

Additionally, we may request more information if the Alphanumeric Sender ID is not your organization's name or acronym, initialism, or contraction of the name. 

To get you up and running as quickly as possible, please fill out the documents completely and accurately and provide any other required information. 

Provide the Document(s) for Sender ID Registration

Once you have downloaded the form, follow these general instructions: 

  1. Fill in the yellow highlighted fields—completely replace each field with your own information. If a field is not highlighted, don’t change it.
  2. Have the documents signed by an authorized signatory of the Sender.
  3. In the yellow highlighted fields, add the Sender’s letterhead and/or logo, and sign where indicated.
  4. Go to the Twilio Alpha Sender ID Registration Page and upload your forms and registration information for the Australia.

Required fields include:

  • Company Letterhead
  • Date
  • Place
  • Alphanumeric Sender ID
  • Company Legal Name
  • Place of Incorporation
  • Business Registration Number 
  • Website Domain Name
  • Contact Email
  • Name and Title 
  • Signature

Letter for Direct Twilio Customers



Letters for Third Parties

Version 2 (June 2023):




Excel File for ANNEX 1 (For customers with multiple Sender IDs to register)

When registering on behalf of third parties, if you have too many Sender IDs, please use the excel file from our ZIP below to fill in the list of Sender IDs in place of ANNEX 1 in the document. Remember to select the 'use case' from the list of possible use cases and attach the supporting document for that use case that is selected.


If you are using ANNEX 1 to submit in bulk, please submit to

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