[Home](./index.md) > [sip.js](./sip.js.md) > [UserAgentClient](./sip.js.useragentclient.md) > [cancel](./sip.js.useragentclient.cancel.md) ## UserAgentClient.cancel() method Since requests other than INVITE are responded to immediately, sending a CANCEL for a non-INVITE request would always create a race condition. A CANCEL request SHOULD NOT be sent to cancel a request other than INVITE. https://tools.ietf.org/html/rfc3261\#section-9.1 Signature: ```typescript cancel(reason?: string, options?: RequestOptions): OutgoingRequestMessage; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | reason | string | | | options | RequestOptions | Cancel options bucket. | Returns: `OutgoingRequestMessage`