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[Home](./index.md) &gt; [sip.js](./sip.js.md) &gt; [RegistererOptions](./sip.js.registereroptions.md) &gt; [instanceId](./sip.js.registereroptions.instanceid.md)

## RegistererOptions.instanceId property

UUID to provide with "+sip.instance" Contact parameter.

<b>Signature:</b>

```typescript
instanceId?: string;
```
