***

id: e61dd97a-b58e-4b72-94b5-bce781c2e2b2
title: DetectAction
slug: /dotnet/reference/calling/actions/detect
description: 'The DetectAction is used to detect DTMF, fax tones, or answering machines.'
max-toc-depth: 3
----------------

[call-1]: /docs/server-sdk/v2/dotnet/reference/calling/call#detect

[call]: /docs/server-sdk/v2/dotnet/reference/calling/call#detectasync

[signalwire-relay-calling-calldetect]: /docs/server-sdk/v2/dotnet/reference/calling/call-detect

[signalwire-relay-calling-detectresult]: /docs/server-sdk/v2/dotnet/reference/calling/results/detect

[signalwire-relay-calling-stopresult]: /docs/server-sdk/v2/dotnet/reference/calling/results/stop

# SignalWire.Relay.Calling.DetectAction

This object returned from [`DetectAsync`][call] method that represents a detection operation that is currently active on a call.

## Properties

| Property    | Type                                                                             | Description                                                       |
| ----------- | -------------------------------------------------------------------------------- | ----------------------------------------------------------------- |
| `ControlID` | string                                                                           | The identifier used to control the operation.                     |
| `Result`    | [`SignalWire.Relay.Calling.DetectResult`][signalwire-relay-calling-detectresult] | Final result of detection.                                        |
| `Completed` | bool                                                                             | Whether the detect operation has completed.                       |
| `Payload`   | [`SignalWire.Relay.Calling.CallDetect`][signalwire-relay-calling-calldetect]     | Payload sent to [`Detect`][call-1] to start the detect operation. |

## Methods

### Stop

Stop the action immediately.

**Parameters**

*None*

**Returns**

[`SignalWire.Relay.Calling.StopResult`][signalwire-relay-calling-stopresult] - The result object to interact with.

**Examples**

> Start a detector and stop it after 5 seconds.

```csharp
DetectAction actionDetect = call.DetectAsync(
    new CallDetect
    {
        Type = CallDetect.DetectType.machine,
        Parameters = new CallDetect.MachineParams
        {
        }
    });

Thread.Sleep(5000);

StopResult resultStop = actionDetect.Stop();
```