> For the complete documentation index, see [llms.txt](https://docs.guestway.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.guestway.io/integrations/sms/sinch-messagemedia-for-sms.md).

# How to connect Sinch MessageMedia

This guide shows you how to connect a Sinch MessageMedia account to Guestway, so you can text guests from the inbox.

{% hint style="info" %}
**Before you start**

* You have the **Super admin** role, or a role with access to integrations.
* A Sinch MessageMedia account with active billing and a dedicated number for SMS.
* The API key and the API secret of your Sinch MessageMedia account.
  {% endhint %}

## Choose the right variant

{% stepper %}
{% step %}

### Check where your account is hosted

If your Sinch MessageMedia account is hosted in the European Union, use **Sinch MessageMedia (EU)**. For all other accounts, use **Sinch MessageMedia (Non-EU)**.

If you are not sure, check your account settings in Sinch MessageMedia, or ask Sinch support.
{% endstep %}

{% step %}

### Find your account ID

In Sinch Hub, go to **Settings** → **Account** → **Account name and ID** and copy the account ID.
{% endstep %}
{% endstepper %}

## Connect your account

{% stepper %}
{% step %}

### Open the integrations

Go to **Settings** → **Organization** → **Integrations** and click **Create**.
{% endstep %}

{% step %}

### Choose the variant

Under **Communication**, click **Sinch MessageMedia (Non-EU)** or **Sinch MessageMedia (EU)**. In **Integration name**, keep the suggested name or enter your own.
{% endstep %}

{% step %}

### Enter the account ID

Paste the account ID in **Account ID**. You cannot change it later.
{% endstep %}

{% step %}

### Connect your account

Click **Login with Username & Password**. Enter the API key in **Username/Email** and the API secret in **Password**, and click **Authenticate**. Then click **Finish**.
{% endstep %}
{% endstepper %}

Guest SMS messages to the dedicated number now arrive in the inbox. Guestway sends your replies from the first dedicated number of the account.

## Troubleshooting

<details>

<summary>Why do SMS messages not appear in the inbox?</summary>

* Check that the integration is in **Settings** → **Organization** → **Integrations** and is **Active**.
* Check that the account has active billing and a dedicated number for SMS.
* If the API key or secret changed in Sinch MessageMedia, click **Re-authenticate** on the integration and enter the new values.
* Send a test SMS from your own phone to the number.

</details>

<details>

<summary>Why does Guestway say no default phone number was found?</summary>

The account has no dedicated number. Add a dedicated number in Sinch MessageMedia, then connect again.

</details>

## Related

* [SMS](/integrations/sms.md): providers, webhooks and limits
* [Integrations](/integrations/integrations.md): every field and action
* [Unified AI inbox](/inbox-and-messaging/unified-ai-inbox.md)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.guestway.io/integrations/sms/sinch-messagemedia-for-sms.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.