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Emitted when transcription data is received during a call. Transcription messages are automatically separated from regular [`infoReceived`](https://docs.cognigy.com/click-to-call/sdk/event-reference/info-received) events.

## Category

Transcription

## Callback Parameters

| Parameter      | Type     | Description                                                                                         |
|----------------|----------|-----------------------------------------------------------------------------------------------------|
| `transcription`| `object` | The transcription data extracted from the `_transcription` property of the incoming SIP INFO message.|

The transcription object typically has the following structure (depending on your Voice Gateway configuration):

| Property  | Type                  | Description                                                                                        |
|-----------|-----------------------|------------------------------------------------------------------------------------------------------|
| `originator` | `string`             | Indicates the source of the transcription, for example, `'user'` or `'bot'`.                          |
| `messages` | `{ text: string }[]` | Array of message objects, each containing a `text` field.                                         |

## Example

```
client.on('transcription', (transcription) => {
  const speaker = transcription.originator === 'user' ? 'User' : 'Bot';
  transcription.messages.forEach((message) => {
    console.log(`${speaker}: ${message.text}`);
  });
});
```

If an incoming info message contains a `_transcription` property, it is emitted only as a `transcription` event — not as an [`infoReceived`](https://docs.cognigy.com/click-to-call/sdk/event-reference/info-received) event.

## Transcription Filtering

The SDK automatically separates transcription data from regular info messages. No additional configuration is needed — the filtering is handled automatically:

- **`transcription` event**: Receives only messages that contain a `_transcription` property.
- **`infoReceived` event**: Receives all other info messages.

This means you can listen to both events independently without worrying about duplicates.

## More Information

- [infoReceived](https://docs.cognigy.com/click-to-call/sdk/event-reference/info-received)
- [Types](https://docs.cognigy.com/click-to-call/sdk/api-reference/types#transcription-data)

Last modified on April 21, 2026.