## Timeouts and failover

- Sinch enforces a **5-second response timeout**. Slow responses may affect call quality.
- Webhook requests are **blocking**: execution of the call flow pauses until the endpoint responds, and the next command runs once a response has been received.
- Webhook URLs are configured on the service via the [Services API](/docs/voice/api-reference/voice/services) or the [Dashboard](https://dashboard.sinch.com/voice/services). The `webhook` SVAML command carries its own `url` and `fallbackUrl` for mid-call events.