[Home](./index.md) > [sip.js](./sip.js.md) > [AckableIncomingResponseWithSession](./sip.js.ackableincomingresponsewithsession.md) > [ack](./sip.js.ackableincomingresponsewithsession.ack.md) ## AckableIncomingResponseWithSession.ack() method Send an ACK to acknowledge this response. Signature: ```typescript ack(options?: RequestOptions): OutgoingAckRequest; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | options | RequestOptions | Request options bucket. | Returns: `OutgoingAckRequest`