***

## title: SIP

SIP outbound is used when your Voice AI scenario needs to call PBX extensions, contact-center platforms, or carrier SIP endpoints.

## Setup flow

1. Define destination SIP URI and caller identity.
2. Start the outbound scenario with URI and caller ID in custom data.
3. Place the call with `VoxEngine.callSIP(...)`.
4. After the call is connected, create your connector client and bridge audio.

```js title="SIP outbound leg"
const call = VoxEngine.callSIP(`sip:${destination}@sip.example.com`, callerId);
```

## Voice AI notes

* Create and bridge the connector only after `CallEvents.Connected`.
* Keep SIP routes separated by tenant/region to map to the right prompt and tools.
* Capture failure codes in logs to speed up interop debugging.

## Common issues

* SIP URI formatting mismatch.
* Missing authentication headers or incorrect trunk policy.
* Network policy blocks signaling or RTP.

## Links

* SIP guide: [https://voximplant.com/docs/guides/calls/sip](https://voximplant.com/docs/guides/calls/sip)
* SIP outbound API (`callSIP`): [https://voximplant.com/docs/references/voxengine/voxengine/callsip](https://voximplant.com/docs/references/voxengine/voxengine/callsip)

<Info title="Screenshots needed">
  - SIP trunk/endpoint configuration used for outbound test calls.
  - Outbound scenario run with SIP destination data.
</Info>