[Home](./index.md) > [sip.js](./sip.js.md) > [ReferrerOptions](./sip.js.referreroptions.md) ## ReferrerOptions interface Options for [Referrer](./sip.js.referrer.md) constructor. Signature: ```typescript export interface ReferrerOptions ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [extraHeaders](./sip.js.referreroptions.extraheaders.md) | Array<string> | |