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

# Flutter WebRTC SDK Socket Message Handler

> The event handler that is used as a callback function when messages are received from the Telnyx Websocket Connection.

### OnSocketMethodReceived

The `OnSocketMethodReceived` event handler is a callback function that is called when a message is received from the Telnyx WebSocket connection. The message is passed as a parameter to the callback function.

```dart theme={null}
typedef OnSocketMessageReceived = void Function(TelnyxMessage message);
```

### TelnyxMessage

This class is used to represent a message received from the Telnyx Socket. It contains a `socketMethod` which is a string representing the type of message received and a `ReceivedMessage` which contains the message data.

```dart theme={null}
class TelnyxMessage {
  String socketMethod;
  ReceivedMessage message;

  TelnyxMessage({required this.socketMethod, required this.message});
}
```

### Socket Methods

The socket method can be one of the following:

```dart theme={null}
class SocketMethod {
  static const answer = 'telnyx_rtc.answer';
  static const invite = 'telnyx_rtc.invite';
  static const bye = 'telnyx_rtc.bye';
  static const modify = 'telnyx_rtc.modify';
  static const media = 'telnyx_rtc.media';
  static const info = 'telnyx_rtc.info';
  static const ringing = 'telnyx_rtc.ringing';
  static const clientReady = 'telnyx_rtc.clientReady';
  static const gatewayState = 'telnyx_rtc.gatewayState';
  static const ping = 'telnyx_rtc.ping';
  static const login = 'login';
  static const attachCall = 'telnyx_rtc.attachCalls';
  static const attach = 'telnyx_rtc.attach';
}
```

### ReceivedMessage

The received message contains the data of the message received from the Telnyx Socket. It will contain the actual message as well as the state of the Call, client and SDK.