## Category

Call

## Callback Parameters

| Parameter | Type | Description |
| --- | --- | --- |
| `session` | [`CallSession`](https://docs.cognigy.com/click-to-call/sdk/api-reference/types#callsession) | The failed call session. |
| `endInfo` | [`CallEndInfo`](https://docs.cognigy.com/click-to-call/sdk/api-reference/types#callendinfo) | Information about why the call failed. |

## Example

```
client.on('failed', (session, endInfo) => {
  console.error('Call failed. Cause:', endInfo.cause);
  console.error('Originator:', endInfo.originator);
  console.error('Description:', endInfo.description);
});
```

## More Information

- [ended](https://docs.cognigy.com/click-to-call/sdk/event-reference/ended)
- [error](https://docs.cognigy.com/click-to-call/sdk/event-reference/error)
- [CallEndInfo](https://docs.cognigy.com/click-to-call/sdk/api-reference/types#callendinfo)

Last modified on April 21, 2026.