# Set Up SMS Sending

SMS sending in Engage Studio uses a short code provisioned and assigned to your workspace by Treasure AI. Complete this setup before creating a campaign so that Engage Studio can identify the sender and the delivery activation can resolve each recipient's phone number.

## Prerequisites

You need:

- An Engage Studio workspace.
- A Parent Segment with a phone-number column.
- A sender provisioning request coordinated with your Treasure AI account team.
- Consent and opt-out logic in your audience or activation.


## Request and Confirm a Sender

1. Contact your Treasure AI account team to request a short code for your workspace.
2. Provide the workspace and provisioning information requested by your account team.
3. Confirm that the short code has been assigned to the workspace before creating a campaign.
4. Confirm that the sender appears in the SMS campaign configuration.


Treasure AI-supported setup is required for sender provisioning. Sender provisioning is not a self-service step in the SMS campaign editor.

## Prepare the Audience

Your Parent Segment must include the phone number that will receive the message. Store the number in [E.164 format](https://help.twilio.com/articles/1260803420489), including the country code and without spaces or punctuation. For example:

```text
+12125551234
```

Apply your consent and opt-out rules in the Parent Segment or activation. Engage Studio does not automatically remove opted-out recipients from your Parent Segment.

For the full consent and opt-out flow, see [Manage SMS Consent and Opt-Outs](/ja/products/marketing-cloud/engage-studio/channels/sms/manage-sms-consent-and-opt-outs).

## Configure the Phone-Number Mapping

When you create the campaign activation, map the recipient phone-number column to `phone_number`. Map every additional profile column used by a Liquid variable in the message.

For example, a message that uses `{{ profile.first_name }}` requires a matching `first_name` output mapping. See [SMS Message Requirements and Limits](/ja/products/marketing-cloud/engage-studio/channels/sms/sms-message-requirements) for the complete mapping rules.

## Next Steps

- [Create an SMS Campaign](/ja/products/marketing-cloud/engage-studio/channels/sms/create-sms-campaign)
- [Configure SMS Delivery Windows](/ja/products/marketing-cloud/engage-studio/channels/sms/configure-sms-delivery-windows)
- [Troubleshoot SMS Delivery](/ja/products/marketing-cloud/engage-studio/channels/sms/troubleshoot-sms-delivery)