> ## Documentation Index
> Fetch the complete documentation index at: https://cometchat-22654f5b-docs-agent-in-group-react-v6.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Default Calling

> Default Calling — CometChat documentation.

This section will provide information on how a complete calling workflow can be set up using CometChat. We've built the complete workflow to help your users make calls, receive calls as well as accept/reject calls.

Let us assume Alex to be the call initiator and Bob is the receiver.

1. Alex initiates the call to Bob using the **initiateCall()** method.

2. Bob now has two choices:

   1. Accept the call from Alex using the **acceptCall()** method.
   2. Reject the call from Alex using the **rejectCall("rejected")** method passing the status as `rejected`.

3. In the meantime, Alex has the option to cancel the call he initiated to Bob using the **rejectCall("cancelled")** method passing the status as `cancelled`.

4. If Bob accepts the call from Alex, both Alex and Bob need to call the **startCall()** method. Alex in the **onOutgoingCallAccepted()** method of the `CallListener` and Bob in the success obtained from the `acceptCall()` method and both will be connected to each other.

## Initiate Call

The `initiateCall()` method sends a call request to a user or a group.

<Tabs>
  <Tab title="Dart (User)">
    ```dart theme={null}
    String receiverID = "UID";
    String receiverType = CometChatConstants.RECEIVER_TYPE_USER;
    String callType = CometChatConstants.CALL_TYPE_VIDEO;

    Call call = Call(receiverUid: receiverID, receiverType: receiverType, type: callType);

    CometChat.initiateCall(
        call,
        onSuccess: (Call call){
          debugPrint("Initiated");
        }, onError: (CometChatException e){
          debugPrint("Error: $e");
        }
    );
    ```
  </Tab>

  <Tab title="Dart (Group)">
    ```dart theme={null}
    String receiverID = "UID";
    String receiverType = CometChatConstants.RECEIVER_TYPE_GROUP;
    String callType = CometChatConstants.CALL_TYPE_VIDEO;

    Call call = Call(receiverUid: receiverID, receiverType: receiverType, type: callType);

    CometChat.initiateCall(
        call,
        onSuccess: (Call call){
          debugPrint("Initiated");
        }, onError: (CometChatException e){
          debugPrint("Error: $e");
        }
    );
    ```
  </Tab>
</Tabs>

This method takes an object of the `Call` class. The constructor for `Call` class takes the following parameters:

| Parameter      | Description                                                                                                        |
| -------------- | ------------------------------------------------------------------------------------------------------------------ |
| `receiverID`   | The UID or GUID of the recipient                                                                                   |
| `receiverType` | The type of the receiver viz. 1.`CometChatConstants.RECEIVER_TYPE_USER` 2.`CometChatConstants.RECEIVER_TYPE_GROUP` |
| `callType`     | The type of the call viz. 1.`CometChatConstants.CALL_TYPE_AUDIO` 2.`CometChatConstants.CALL_TYPE_VIDEO`            |

On successful initialization, a `Call` object is returned with the details of the call including a unique session ID for the call.

## Receive Calls

For every activity you wish to receive the call events in, you need to register the `CallListener` listener using the `addCallListener()` method.

<Tabs>
  <Tab title="Dart">
    ```dart theme={null}
    import 'package:cometchat/cometchat_sdk.dart';

    class YourClassName extends State<YourClassName> with CallListener {
      @override
      void initState() {
          CometChat.addCallListener(listenerId, this);  //Add listener
      }

      @override
      void dispose() {
        super.dispose();
    		CometChat.removeCallListener(listenerId); //Remove listener
      }
      
      @override
      void onIncomingCallCancelled(Call call) {
        super.onIncomingCallCancelled(call);
        debugPrint("onIncomingCallCancelled");
      }

      @override
      void onIncomingCallReceived(Call call) {
        super.onIncomingCallReceived(call);
        debugPrint("onIncomingCallReceived");
      }

      @override
      void onOutgoingCallAccepted(Call call) {
        super.onOutgoingCallAccepted(call);
        debugPrint("onOutgoingCallAccepted");
      }

      @override
      void onOutgoingCallRejected(Call call) {
        super.onOutgoingCallRejected(call);
        debugPrint("onOutgoingCallRejected");
      }

      @override
      void onCallEndedMessageReceived(Call call) {
        super.onCallEndedMessageReceived(call);
        debugPrint("onCallEndedMessageReceived");
      }
    }
    ```
  </Tab>
</Tabs>

| Parametrer   | Description                                                                                    |
| ------------ | ---------------------------------------------------------------------------------------------- |
| `listenerID` | An ID that uniquely identifies that listener. We recommend using the activity or fragment name |

We recommend you remove the listener once the activity or fragment is not in use.

<Tabs>
  <Tab title="Dart">
    ```dart theme={null}
    String listenerId = "UNIQUE_LISTENER_ID";

    CometChat.removeCallListener(listenerId);
    ```
  </Tab>
</Tabs>

As mentioned in the Overview section, Once the call is initiated, there are three options that can be possible:

1. The receiver of the call accepts the call.
2. The receiver of the call rejects the call.
3. The initiator of the call cancels the call.

Please find below how these three scenarios can be implemented:

### Accept the Incoming Call

Once you have received an incoming call from a user or in any group, to accept the call using the `acceptCall()` method.

<Tabs>
  <Tab title="Dart">
    ```dart theme={null}
    String sessionID = "SESSION_ID";

    CometChat.acceptCall(
        sessionId!,
        onSuccess: (Call call){
          debugPrint("Accepted");
        }, onError: (CometChatException e){
          debugPrint("Error: ${e.message}");
        }
    );
    ```
  </Tab>
</Tabs>

| Parameter   | Description                                          |
| ----------- | ---------------------------------------------------- |
| `sessionID` | The unique session ID available in the `Call` object |

### Reject the Incoming Call

To reject the incoming call once it is received using the `rejectCall()` method.

<Tabs>
  <Tab title="Dart">
    ```dart theme={null}
    String sessionID = "SESSION_ID";
    String status = CometChatConstants.CALL_STATUS_REJECTED;

    CometChat.rejectCall(
        sessionId!,
     		status,
        onSuccess: (Call call){
          debugPrint("Rejected");
        }, onError: (CometChatException e){
          debugPrint("Error: ${e.message}");
        }
    );
    ```
  </Tab>
</Tabs>

| Parameter   | Description                                          |
| ----------- | ---------------------------------------------------- |
| `sessionID` | The unique session ID available in the `Call` object |
| `status`    | Reason for rejection of the call                     |

Here the status needs to be set as `CometChatConstants.CALL_STATUS_REJECTED` as the call is being rejected by the receiver of the call.

### Cancel the Outgoing Call

In the case where the initiator wishes to cancel the call, use the same above `rejectCall()` method and just pass the status to the `rejectCall()` method as `CometChatConstants.CALL_STATUS_CANCELLED`

## Start a Call

Once the call request is sent and the receiver has accepted the call, both the initiator and the receiver need to call the `startSession()` method. Starting call session is same as [Direct Call](/sdk/flutter/3.0/direct-calling)