Austria sender registration guidelines

Learn about the mandatory sender ID registration requirements for Austria and how to register your alphanumeric sender IDs in compliance with Austrian regulations.

The Austrian regulator RTR GmbH is introducing a national sender ID registry for alphanumeric A2P SMS traffic. The registry is managed through the eRTR portal.

All alphanumeric sender IDs used to send A2P SMS to Austrian mobile subscribers must be:

• Registered
• Approved by the regulator
• Imported into the national registry

Who is affected?

This regulation applies to:

• All businesses sending A2P SMS
• Using alphanumeric sender IDs (for example, a brand name or company name as the sender)
• Targeting Austrian mobile subscribers

Key dates

What you need to register

For each alphanumeric sender ID, provide the following information:

• Company name: Legal name of the company.
• Company address: Address where the company sending messages is registered.
• Company ZIP code: ZIP code of the city where the company is located.
• Country code: Country's code in ISO standard (two-letter format) where the company sending messages is registered.
• Company email: Company's official business email address. This can differ from the email address associated with the sender.
• Relationship between company and sender: How the sender is connected to the company that owns it (for example, the sender is the company name or an abbreviation of it, or the sender is related to a company product). Write this explanation in German. The regulator does not accept explanations in other languages.

To register a sender, the original brand-owner company must complete and sign the Letter of Authorization template.

All information must be accurate and consistent with the brand identity.

Registration process

You can register a sender in one of the following ways:

• Request a sender in the web interface.
• Use the Submit resource request API endpoint.
• Contact Support or your account manager for help with the registration.

Approval process [#approval-process-registration-process]

The Austrian regulator (RTR) may take up to 20 days to approve a sender registration request. Once approved, the sender ID can be used nationwide across all permitted SMS routes.

The mobile network operator that first obtains approval for a sender ID is considered the sender owner.

What happens if you do not register?

From October 1, 2026, unregistered alphanumeric senders are converted to a numeric sender to prevent delivery failures.

To keep your brand visible, you can add the original alphanumeric sender as a text prefix in the message body. To set this up, contact Support or your Infobip account manager.

To keep your alphanumeric sender, make sure your sender IDs are registered and approved.