[Home](./index.md) > [sip.js](./sip.js.md) > [Referrer](./sip.js.referrer.md) > [refer](./sip.js.referrer.refer.md) ## Referrer.refer() method Sends the REFER request. Signature: ```typescript refer(options?: ReferrerReferOptions): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | options | ReferrerReferOptions | An options bucket. | Returns: `Promise`