[Home](./index.md) > [sip.js](./sip.js.md) > [RegistererUnregisterOptions](./sip.js.registererunregisteroptions.md) ## RegistererUnregisterOptions interface Options for [Registerer.unregister()](./sip.js.registerer.unregister.md). Signature: ```typescript export interface RegistererUnregisterOptions ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [all](./sip.js.registererunregisteroptions.all.md) | boolean | If true, unregister all contacts. | | [requestDelegate](./sip.js.registererunregisteroptions.requestdelegate.md) | OutgoingRequestDelegate | See core API. | | [requestOptions](./sip.js.registererunregisteroptions.requestoptions.md) | RequestOptions | See core API. |