[Home](./index.md) > [sip.js](./sip.js.md) > [RegistererOptions](./sip.js.registereroptions.md) ## RegistererOptions interface Options for [Registerer](./sip.js.registerer.md) constructor. Signature: ```typescript export interface RegistererOptions ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [expires](./sip.js.registereroptions.expires.md) | number | Registration expiration time in seconds. | | [extraContactHeaderParams](./sip.js.registereroptions.extracontactheaderparams.md) | Array<string> | Array of extra Contact header parameters. | | [extraHeaders](./sip.js.registereroptions.extraheaders.md) | Array<string> | Array of extra headers added to the REGISTER. | | [instanceId](./sip.js.registereroptions.instanceid.md) | string | UUID to provide with "+sip.instance" Contact parameter. | | [logConfiguration](./sip.js.registereroptions.logconfiguration.md) | boolean | If true, constructor logs the registerer configuration. | | [params](./sip.js.registereroptions.params.md) | {
fromDisplayName?: string;
fromTag?: string;
fromUri?: URI;
toDisplayName?: string;
toUri?: URI;
} | | | [regId](./sip.js.registereroptions.regid.md) | number | Value to provide with "reg-id" Contact parameter. | | [registrar](./sip.js.registereroptions.registrar.md) | URI | The URI of the registrar to send the REGISTER requests. |