Australia | Alphanumeric sender ID Registration

This guide will walk you through the process of registering an alphanumeric sender ID for your business to comply with Australian Communications and Media Authority (ACMA) regulations. As of November 30, 2025, all businesses sending SMS messages in Australia must register their alphanumeric sender IDs through ACMA Assist.

What you'll need before you start

Before starting the registration process, gather the following information:

Business information

• Australian Business Number (ABN) - Must be current and active

• Business address - Physical address registered with your ABN

• Business website - Official website that matches one of your registered business names. If you don't have a website, you can provide a link to a public page that represents your business - such as a social media page. 

• Business telephone number - Include country code (e.g., +61 for Australia)

Alphanumeric sender ID

• Sender ID name - The text-based sender ID you want to register (e.g., "SINCH")

• Ensure you follow the formatting rules that have been determined by the ACMA.

Authorized representative information

You'll need to designate an authorized business representative who can approve the registration and have the following information available:

• Full name

• Email address

• Mobile phone number

Registration Process

The registration process consists of four main steps:

1. Business details

2. Alphanumeric validation

3. Authorized representative

4. Review & submit

Step 1: Access the registration portal

1. Log in to your Sinch MessageMedia account and navigate to Settings > Numbers > Alphanumeric sender IDs (alpha tags) 

2. Click "Add new alphanumeric" or the add button

Step 2: Select country and account Type

• In the popup window, select Australia from the country dropdown

• Read the important notification about ACMA registration requirements

• Click Next to continue

  

1. Your own business (also referred to as Direct Customer) flow: This means you're registering a sender ID for your own company linked to this account.

2. Another authorised business (entity associate) flow: Registering on behalf of another business.