# Austria sender ID registration in AWS End User Messaging SMS
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All alphanumeric sender IDs used to send SMS messages to Austrian mobile numbers (\+43) must be registered with the RTR (Rundfunk und Telekom Regulierungs-GmbH), the Austrian telecommunications regulator. Starting October 1, 2026, unregistered alphanumeric sender IDs will be blocked by Austrian mobile operators and will not deliver messages to Austrian recipients.

Dedicated phone numbers (local long codes or short codes) are not affected by this regulation and do not require registration.

Austria sender IDs must comply with the following rules:
+ Minimum 3 characters, maximum 11 characters
+ Permitted characters: A-Z, a-z, 0-9, space, \+, -, \_, &
+ German umlauts (ä, ö, ü, ß) are not permitted
+ Cannot begin with a plus sign (\+)
+ Cannot have leading or trailing spaces
+ Cannot resemble a phone number
+ Generic terms are not permitted (for example: doctor, pharmacy, OTP, SMS info)
+ Case-sensitive — registering "MyBrand" does not cover "MYBRAND"

1. Open the AWS End User Messaging SMS console at [https://console.aws.amazon.com/sms-voice/](https://console.aws.amazon.com/sms-voice/).

1. In the navigation pane, under **Registrations**, choose **Create registration**.
**Note**  
If you already created a registration when requesting the origination identity, use that existing registration form.

   For **Registration form name**, enter a friendly name.

   Choose **Next**.

1. In the **Sender ID info** section, enter the following:
   + For **Sender ID**, enter the sender ID to register. The sender ID must be between 3 and 11 characters, using only permitted characters (A-Z, a-z, 0-9, space, \+, -, \_, &). No German umlauts are allowed. The value is case-sensitive — register the exact casing you intend to use when sending messages.
   + For **Sender ID description**, provide a description of how this sender ID relates to your company. If the connection between your sender ID and your company name is not obvious, upload proof such as a trademark certificate in the **Proof of sender ID connection** field.

   Choose **Next**.

1. In the **Company info** section, enter the following:
   + For **Company name**, enter your company name as officially registered.
   + For **Company address**, enter your company's registered address including postal code.
   + For **Contact email**, enter the email address for communications about this registration.

   Choose **Next**.

1. In the **Proof of sender ID connection** section:
   + If your sender ID does not obviously match your company name, upload supporting documentation such as a trademark certificate that demonstrates your right to use the sender ID.

   Choose **Next**.

1. In the **Letter of authorization** section:
   + Download, complete, and attach the [letter of authorization](samples/Austria_SenderId_LetterOfAuthorization.zip). Valid upload file types are PDF, PNG, and JPEG with a maximum file size of 500KB.

   Choose **Next**.

1. In **Messaging Use Case**, do the following:
   + For **Use case category**, choose the category that best describes your messaging use case.
   + For **Use case description**, provide additional context about how you will use this sender ID.

   Choose **Next**.

1. In **Message samples**, do the following:
   + For **Message Sample 1**, enter an example SMS message body that will be sent to your end users.
   + For **Message Sample 2 – optional** and **Message Sample 3 – optional**, enter additional example messages if needed.

   Choose **Next**.

1. On the **Review and submit** page, verify the information you are about to submit is correct. To make updates, choose **Edit** next to the section.

1. Choose **Submit registration**.

What happens if I send messages with an unregistered sender ID after October 1, 2026?  
Messages sent using an unregistered alphanumeric sender ID will be blocked by Austrian mobile operators and will not be delivered.

Can I update my registration details after submitting?  
No. Once a registration is submitted, the associated information cannot be amended. You must create a new registration and wait for the 14-day activation period to complete.

Can I re-register a deleted sender ID?  
Yes, but you must wait 30 days after deletion before you can re-register the same sender ID.

Are dedicated phone numbers affected by this regulation?  
No. Dedicated phone numbers (local long codes, short codes) are not affected and do not require registration.

Is my sender ID case-sensitive?  
Yes. Austria sender ID registrations are case-sensitive. If you register "MyBrand", messages sent as "MYBRAND" or "mybrand" are treated as different sender IDs and will be blocked if not separately registered.