[Home](./index.md) > [sip.js](./sip.js.md) > [SimpleUser](./sip.js.simpleuser.md) > [sendDTMF](./sip.js.simpleuser.senddtmf.md) ## SimpleUser.sendDTMF() method Send DTMF. Signature: ```typescript sendDTMF(tone: string): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | tone | string | Tone to send. | Returns: `Promise` ## Remarks Send an INFO request with content type application/dtmf-relay.