[Home](./index.md) > [sip.js](./sip.js.md) > [PublisherOptions](./sip.js.publisheroptions.md) ## PublisherOptions interface Options for [Publisher](./sip.js.publisher.md) constructor. Signature: ```typescript export interface PublisherOptions ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [body](./sip.js.publisheroptions.body.md) | string | | | [contentType](./sip.js.publisheroptions.contenttype.md) | string | | | [expires](./sip.js.publisheroptions.expires.md) | number | Expire value for the published event. | | [extraHeaders](./sip.js.publisheroptions.extraheaders.md) | Array<string> | Array of extra headers added to the PUBLISH request message. | | [params](./sip.js.publisheroptions.params.md) | {
fromDisplayName?: string;
fromTag?: string;
fromUri?: URI;
toDisplayName?: string;
toUri?: URI;
} | | | [unpublishOnClose](./sip.js.publisheroptions.unpublishonclose.md) | boolean | If set true, UA will gracefully unpublish for the event on UA close. |