[Home](./index.md) > [sip.js](./sip.js.md) > [Invitation](./sip.js.invitation.md) > [progress](./sip.js.invitation.progress.md) ## Invitation.progress() method Indicate progress processing the invitation. Signature: ```typescript progress(options?: InvitationProgressOptions): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | options | InvitationProgressOptions | Options bucket. | Returns: `Promise` ## Remarks Report progress to the the caller. Replies to the INVITE request with a 1xx provisional response. Resolves once the response sent, otherwise rejects.