This guide walks you through how to register an alphanumeric sender ID when you’re acting as an Entity Associate on behalf of a client. It explains what business information you need to provide for both organizations, how sender ID validation works, and how to nominate the right authorized representatives. You’ll also learn what to review before submitting the application, what each status means after submission, and what to expect from ACMA during the approval process.
Registration Process
Step 1: Enter your business details (Entity Associate)
First, you'll provide information about your own business - the Entity Associate organization that has permission to register on behalf of the client.
Verify Pre-filled information
The system will automatically retrieve your business information from the Australian Business Register:
Australian Business Number (ABN) - Your organization's ABN
Entity name - Your registered company name
Business name(s) - All trading names registered to your ABN
Add required information
Complete the following fields for your organization:
Business address - Enter your registered business address
Business website - Enter your official business website
Telephone number - Include country code and area code (e.g., +61 3 1234 5678)
Step 2: Enter Another authorized business details (client)
Now, you'll provide information about the client business you're registering the sender ID for.
Enter client business ABN
In the Another authorized business section, enter the client's ABN or business name
The system will automatically look up and populate:
Entity name
Business name(s)
Complete client business information
Business address - Confirm or enter the client's registered business address using the Address lookup
Business website - Enter the client's official business website. Must be the official website for their entity name or business name.
Telephone number - Provide a business contact number for the client
Click Next to continue
Step 3: Validate the Alphanumeric Sender ID
Critical: The sender ID must match the client's business details, not your Entity Associate organization.
Enter your alphanumeric name in the text field
Click the "Validate" button
The system will check if your sender ID matches your registered business details:
Success message: "Business match confirmed — you're good to go"
This means your sender ID closely matches your entity name, business name, trademark, or domain
You can proceed to the next step
Error message: If validation fails, you'll need to choose a different sender ID that better matches your registered business details
Validation Requirements:
Refer to Australia | Upcoming changes to alphanumeric sender ID (formerly alpha tag) registration and usage
Once validation succeeds, click Next.
Step 4: Designate authorized representatives
As an Entity Associate, you must provide authorized representatives for BOTH businesses - your organization and the client business.
Authorized Representative for your business
First, designate who will approve this registration on behalf of your Entity Associate organization:
You have two options:
Option A: I am an authorized representative
Select if you're listed on the ABR as having authority or if you have been authorized by an ABR Authorized contacts to be an authorized user in ACMA Assist portal
Your details will be automatically filled from your Hub Account
Option B: I am completing this on behalf of an authorized representative
Provide the representative's name, email, and phone number of an ABR authorize contact or a user authorized by an ABR Authorized contacts to be an authorized user in ACMA Assist portal
Authorized Representative for the client business
Next, designate the authorized representative for the client business you're registering for:
Critical: You must enter details of the client's authorized representative - someone listed on the Australian Business Register for the client's business or a user authorized by the client’s ABR Authorized contacts to be an authorized user in ACMA Assist portal.
Enter the client representative's full name
Enter their email address
Enter their mobile phone number
Contact the client beforehand to confirm you have the correct representative details
Click Next to continue
Step 5: Review and submit
This is your final opportunity to review all information before submission.
Review Each Section
The review page displays information for both businesses:
Business details (Your business) - Shows "Completed" in green
Your Entity Associate organization's ABN, entity name, business names, address, website, and phone
Another authorized business details (Client) - Shows "Completed" in green
Client's ABN, entity name, business names, address, website, and phone
Alphanumeric validation - Shows "Completed" in green
The validated sender ID that matches the client's business
Authorized business representative (Your business) - Shows "Completed" in green
Your organization's representative details
Authorized business representative (Client) - Shows "Completed" in green
Client's representative details
Set notification preferences
Email notifications (Required) - Your email address is pre-filled
SMS notifications (Optional) - Add a mobile number for time-sensitive updates
Submit your application
Review all sections carefully - information cannot be changed after submission
Ensure you have authorization from the client business
Click "Submit for review"
Your application status will change to "Pending Review"
Viewing your application status
You can check your sender ID registration status at any time:
Go to Settings > Numbers
View the Alphanumeric sender IDs section
Your sender ID will show one of these statuses:
Pending Review - Application submitted, awaiting SMSBroadcast review before submitting to ACMA
Pending ACMA Registration - Under review by ACMA
Active/Verified - Approved and ready to use
Requires Action - Additional information needed
Post-submission
Internal Review & Submit to ACMA
Sinch MessageMedia compliance team verify the application before submitting to ACMA, and the team will reach out to you if further information required.
If all requirements are fulfilled, the team will submit the application to ACMA.
Your application status will change to Pending ACMA Registration.
ACMA Confirmation Email
Your Organization - Entity Associates (First-Time Only)
Important: If this is your first time registering as an Entity Associate, the authorized representative from your organization will receive a confirmation email from ACMA.
The authorized representative from YOUR Organization will receive a confirmation email from ACMA to verify that your organization is authorized to act as an Entity Associate. Your representative must respond to this email to confirm authorization. The application cannot proceed until this confirmation is completed.
Note: This only happens once - subsequent applications will not require this step
Your Customers - Entity Who Owns the Sender ID
The authorized representative of your customer will receive a confirmation email from ACMA to verifies that your organization authorized, the sender ID.
Your representative must action this email to confirm authorization, and the application cannot proceed until this confirmation is completed.
For more information, follow this link.
ACMA Processing
ACMA will review the application, and it will take approximately 24 hours for ACMA to complete the review, however processing times vary based on the complexity of the application.
Approval Notification
You'll receive email and/or an SMS notification when approved. Your sender ID status will change to Pending ACMA Review or Active/ Verified.
The sender ID can then be used for SMS campaigns to Australian numbers.