# Public endpoints

The In-App Calling API uses different endpoints depending on your region.

When creating a Sinch client, choose the regional endpoint used to communicate with the Sinch platform by setting the `environmentHost` parameter. The following regional endpoints are available:

| Endpoint (hostname) | Description |
|  --- | --- |
| `https://ocra.api.sinch.com` | Global - redirected by Sinch to the closest region |
| `https://ocra-euc1.api.sinch.com` | Europe |
| `https://ocra-use1.api.sinch.com` | North America |
| `https://ocra-sae1.api.sinch.com` | South America |
| `https://ocra-apse1.api.sinch.com` | South East Asia 1 |
| `https://ocra-apse2.api.sinch.com` | South East Asia 2 |