> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cognigy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# off

Removes a previously registered event listener.

## Signature

```typescript theme={null}
client.off<T extends EventName>(event: T, callback: EventCallback<T>): this;
```

## Parameters

| Parameter  | Type               | Description                                  | Required |
| ---------- | ------------------ | -------------------------------------------- | -------- |
| `event`    | `EventName`        | The name of the event to stop listening for. | Yes      |
| `callback` | `EventCallback<T>` | The callback function to remove.             | Yes      |

## Returns

`this` — the client instance, allowing method chaining.

<Warning>
  You must pass the same function reference that was used with [`on()`](/click-to-call/sdk/api-reference/on). Anonymous functions can't be removed.
</Warning>

## Example

```typescript theme={null}
const onAnswered = (session) => {
  console.log('Call answered:', session.id);
};

// Subscribe
client.on('answered', onAnswered);

// Unsubscribe
client.off('answered', onAnswered);
```

## More Information

* [on](/click-to-call/sdk/api-reference/on)
* [Event Reference](/click-to-call/sdk/event-reference/overview)