[Home](./index.md) > [sip.js](./sip.js.md) > [Registerer](./sip.js.registerer.md) > [register](./sip.js.registerer.register.md) ## Registerer.register() method Sends the REGISTER request. Signature: ```typescript register(options?: RegistererRegisterOptions): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | options | RegistererRegisterOptions | | Returns: `Promise` ## Remarks If successful, sends re-REGISTER requests prior to registration expiration until `unsubscribe()` is called. Rejects with `RequestPendingError` if a REGISTER request is already in progress.