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[Home](./index.md) &gt; [sip.js](./sip.js.md) &gt; [UserAgentCoreDelegate](./sip.js.useragentcoredelegate.md)

## UserAgentCoreDelegate interface

User Agent Core delegate.

<b>Signature:</b>

```typescript
export interface UserAgentCoreDelegate 
```

## Methods

|  Method | Description |
|  --- | --- |
|  [onInvite(request)](./sip.js.useragentcoredelegate.oninvite.md) | Receive INVITE request. |
|  [onMessage(request)](./sip.js.useragentcoredelegate.onmessage.md) | Receive MESSAGE request. |
|  [onNotify(request)](./sip.js.useragentcoredelegate.onnotify.md) | DEPRECATED. Receive NOTIFY request. |
|  [onRefer(request)](./sip.js.useragentcoredelegate.onrefer.md) | Receive REFER request. |
|  [onRegister(request)](./sip.js.useragentcoredelegate.onregister.md) | Receive REGISTER request. |
|  [onSubscribe(request)](./sip.js.useragentcoredelegate.onsubscribe.md) | Receive SUBSCRIBE request. |