[Home](./index.md) > [sip.js](./sip.js.md) > [InvitationProgressOptions](./sip.js.invitationprogressoptions.md) ## InvitationProgressOptions interface Options for [Invitation.progress()](./sip.js.invitation.progress.md). Signature: ```typescript export interface InvitationProgressOptions ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [body](./sip.js.invitationprogressoptions.body.md) | string | {
body: string;
contentType: string;
} | Body | | [extraHeaders](./sip.js.invitationprogressoptions.extraheaders.md) | Array<string> | Array of extra headers added to the response. | | [reasonPhrase](./sip.js.invitationprogressoptions.reasonphrase.md) | string | Reason phrase for response. | | [rel100](./sip.js.invitationprogressoptions.rel100.md) | boolean | Send reliable response. | | [sessionDescriptionHandlerModifiers](./sip.js.invitationprogressoptions.sessiondescriptionhandlermodifiers.md) | Array<SessionDescriptionHandlerModifier> | Modifiers to pass to SessionDescriptionHandler's getDescription() and setDescription(). | | [sessionDescriptionHandlerOptions](./sip.js.invitationprogressoptions.sessiondescriptionhandleroptions.md) | SessionDescriptionHandlerOptions | Options to pass to SessionDescriptionHandler's getDescription() and setDescription(). | | [statusCode](./sip.js.invitationprogressoptions.statuscode.md) | number | Status code for response. |