> For the complete documentation index, see [llms.txt](https://user.netmera.com/netmera-developer-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://user.netmera.com/netmera-developer-guide/integrations/via-integration/etk-rejection-via-sms.md).

# ETK Rejection via SMS

The VIA SMS RET mechanism allows service providers with a ViA package to collect `ETK` rejection notifications from recipients via SMS. These messages are sent to the short code **3338** (`source: IYS_KISAMESAJ`).

* Rejection notifications can be processed using **brand IYS numbers** or **brand short names**.
* A **maximum of three brand short names** can be assigned per brand.
* Short names can be managed via the [**İYS Web**](https://hs.iys.org.tr/) portal under **Brand Short Name Management.**

### SMS format in the IYS test environment

Recipients must send an SMS in the following format:

```plaintext
RET <BRAND_SHORT_NAME> SDXIYS → 3338
```

#### Example request

```plaintext
RET SDXNETMERA SDXIYS → 3338
```

### Processing and synchronization with Netmera

When a recipient unsubscribes via SMS, their rejection is **recorded in the IYS system**.

**Netmera Sync:**

Netmera syncs data **nightly** to track and update permission changes. If a recipient’s permission status changes, it is **updated in Netmera's system automatically**.


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