***

id: 2234678b-619e-4a9b-ba9f-c699fbf43ec2
title: detectFax
slug: /node/reference/voice/call/detect-fax
description: detectFax method for the Call class.
max-toc-depth: 3
----------------

[calldetect-8]: /docs/server-sdk/v3/node/reference/voice/call-detect

### detectFax

* **detectFax**(`params?`): `Promise<CallDetect>` - See [CallDetect][calldetect-8] for more details.

Detects the presence of a fax machine.

#### Parameters

| Name                  | Type               | Description                                                                                 |
| :-------------------- | :----------------- | :------------------------------------------------------------------------------------------ |
| `params?`             | `Object`           | -                                                                                           |
| `params.timeout?`     | `number`           | Number of seconds to run the detector for. Defaults to 30.0.                                |
| `params.tone?`        | `"CED"` \| `"CNG"` | The fax tone to detect: <code>CED</code> or <code>CNG</code>. Defaults to <code>CED</code>. |
| `params.waitForBeep?` | `boolean`          | Whether to wait until the device is ready for voicemail delivery. Defaults to false.        |

#### Returns

`Promise<CallDetect>` - See [CallDetect][calldetect-8] for more details.

#### Example

```js
const detect = await call.detectFax();
const result = await detect.ended();

console.log("Detect result:", result.type);
```