Sender IDs

Using a sender ID allows you to use a name (like "Ortto") to send SMS messages, rather than a number (e.g. +61412345678). This can help your SMS recipients identify you as the sender, which may help to improve open rates.

Click Add a sender ID to send using a name, and populate the Sender ID field with the name you wish to use.

Your sender ID must contain:

  • a minimum of 3 characters,
  • a maximum of 11 characters, and
  • at least 1 letter.

The characters supported are lower- and uppercase alphabet (a-z, A-Z), numbers 0-9, and space.


  • Not all countries are supported for sender ID. If you have sender ID enabled and are sending SMS messages to a country in which it is not supported, your sender ID will be replaced with your phone number.
  • See if your country is supported for sender ID in this Twilio table.

Using a sender ID will replace the Brand prefix in your SMS messages, as brand prefix is no longer required (unless you are sending to a country where sender ID is not supported, then the brand prefix will remain).

NOTE: Your sender ID will be pre-filled in the Sender ID section of the Setup step when creating an SMS message (as a single-send campaign, or as a journey SMS message shape).

If you have more than one sender ID, you will be able to select which one you want to use for each SMS message you create. Learn more under Setup in Creating an SMS campaign.

Register your sender ID

To comply with anti-spam laws, your sender ID must be registered with the SMS provider to prove brand ownership. Failure to do this can result in the SMS being blocked.

Ortto uses Twilio to send SMS, therefore to enable sending with a sender ID using Ortto’s built-in SMS functionality, you will need to complete the Twilio Sender ID registration process.

The following instructions apply to users who are sending SMS messages via Ortto, including users who have connected a Twilio account to Ortto.

NOTE: If you have connected a Tall Bob account to Ortto, please follow the advice from Tall Bob about registering your sender ID.

There are two key steps to registering your sender ID:

  1. Fill out the Twilio sender ID registration form, using your Account SID.
  2. As part of the registration process, you will also need to fill out and submit the third party sender ID registration form.

This form is one of the required forms to complete when you select your country at Country receiving SMS Texts. We have prefilled the form with the relevant Ortto organizational information and left highlighted areas for you to complete with your organization’s information. You’ll then upload the completed form (along with any other forms required by Twilio) as part of your sender ID registration.


Your Account SID is provided in your Ortto account at Settings > SMS > Sender ID, when you click to add a new sender ID. It will be under the Account SID heading.

Insert the Account SID into the Twilio form against both of the following fields:

  • Twilio Account SID.
  • Subaccount Account SID (optional).

If you do not see an Account SID field, it likely means you have not yet added a phone number to your account.

If you are using your own Twilio account, the Account SID can be found on the Twilio dashboard.

Once you have completed the registration process, in Ortto you can mark the checkbox to indicate registration is complete, however SMS may still be blocked until Twilio confirms your registration.