> 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).

# Sinch MessageMedia (For SMS)

### Sinch MessageMedia

Guestway integrates with Sinch MessageMedia to enable SMS communication with guests directly from your Guestway Inbox. Connect your Sinch MessageMedia account, and inbound guest texts are routed into Guestway as conversations — replies you send from the Inbox are delivered as SMS automatically.

Two variants are available: **Sinch MessageMedia (Non-EU)** for accounts in most regions outside of the EU, and **Sinch MessageMedia EU** for accounts hosted in the European Union.

***

#### How it works

When you connect your Sinch MessageMedia account to Guestway, SMS messages sent to your Sinch MessageMedia number are forwarded into your Guestway Inbox. When you reply from the Inbox, Guestway delivers the message back to the guest as an SMS through Sinch MessageMedia.

***

#### Choosing the right variant

Guestway offers two Sinch MessageMedia integrations. Choose the one that matches where your Sinch MessageMedia account is hosted:

| Variant                   | When to use                                                                              |
| ------------------------- | ---------------------------------------------------------------------------------------- |
| **Sinch MessageMedia**    | Your account is hosted outside the EU (e.g., US, Australia, or global).                  |
| **Sinch MessageMedia EU** | Your account is hosted in the European Union. Required for EU data residency compliance. |

{% hint style="info" %}
Not sure which variant to choose? Check your Sinch MessageMedia account settings or contact Sinch MessageMedia support to confirm your account's hosting region.
{% endhint %}

The setup steps are identical for both variants — the only difference is the regional endpoint Guestway connects to.

***

#### Before you start

* A **Sinch MessageMedia account** with active billing and an SMS-capable number.
* Your Sinch MessageMedia **API credentials** (found in your Sinch MessageMedia account settings).
* **Super Admin** role (or higher) within your Guestway Organization.

***

#### Connecting your Sinch MessageMedia account

1. In Guestway, go to **Settings → Integrations**.
2. Click **Create**.
3. Find **Sinch MessageMedia** (or **Sinch MessageMedia EU**) and click **Connect**.
4. Enter your Sinch MessageMedia credentials when prompted.

| Field          | Value                                              |
| -------------- | -------------------------------------------------- |
| **API Key**    | Found in your Sinch MessageMedia account settings. |
| **API Secret** | Found alongside the API Key.                       |

5. Complete the remaining wizard steps. Guestway validates your credentials and activates the integration.

Once connected, SMS conversations will begin appearing in your Guestway **Inbox**.

***

#### What changes after connecting

Once the Sinch MessageMedia integration is active:

* **Inbound SMS** from guests appear as conversations in your Guestway **Inbox**, alongside messages from other channels (Airbnb, Booking.com, WhatsApp, etc.).
* **Outbound replies** you send from the Inbox are delivered to the guest as SMS through your connected Sinch MessageMedia number.

***

#### Troubleshooting

If SMS messages are not appearing in your Guestway Inbox after connecting:

1. Confirm the integration is listed and active in **Settings → Integrations**.
2. Verify that your Sinch MessageMedia account has active billing and the connected number is SMS-capable.
3. Check that the API credentials entered during setup are still valid — credentials may expire or be rotated in the Sinch MessageMedia dashboard.
4. Send a test SMS to the connected number from a personal phone and check whether it arrives.

If the issue persists, contact **<support@guestway.io>**.

***

#### Related pages

* Twilio (For SMS) — an alternative SMS integration using Twilio.
* Property Management Systems — configure the PMS integration that powers your Guestway organization.
* Unified AI Inbox — where SMS conversations appear alongside all other channels.

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