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Flashphoner.init(this);

SessionOptions sessionOptions = new SessionOptions(mWcsUrlView.getText().toString());
session = Flashphoner.createSession(sessionOptions);

Connection connection = new Connection();
connection.setAppKey("clickToCallApp");
/**
  * Connect to WCS server
  */
session.connect(connection);

@Override
public void onConnected(final Connection connection) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            mCallButton.setText(R.string.action_hangup);
            mCallButton.setTag(R.string.action_hangup);
            mCallButton.setEnabled(true);
            mCallStatus.setText("Connection: " + connection.getStatus());

            /**
              * Pass 'callee' to the callOptions and create a new call object
              */
            CallOptions callOptions = new CallOptions(mCalleeView.getText().toString());
            call = session.createCall(callOptions);
            call.on(new CallStatusEvent() {
                /**
                  * WCS received 100 TRYING from SIP
                  * @param call
                  */
                @Override
                public void onTrying(final Call call) {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            mCallButton.setText(R.string.action_hangup);
                            mCallButton.setTag(R.string.action_hangup);
                            mCallButton.setEnabled(true);
                            mCallStatus.setText("Call: " + call.getStatus());
                        }
                    });
                }

                /**
                  * WCS received BUSY_HERE or BUSY_EVERYWHERE from SIP
                  * @param call
                  */
                @Override
                public void onBusy(final Call call) {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            mCallButton.setText(R.string.action_call);
                            mCallButton.setTag(R.string.action_call);
                            mCallButton.setEnabled(true);
                            mCallStatus.setText("Call: " + call.getStatus());
                        }
                    });
                }

                /**
                  * Call failed on server
                  * @param call
                  */
                @Override
                public void onFailed(final Call call) {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            mCallStatus.setText("Call: " + call.getStatus());
                        }
                    });
                }

                /**
                  * WCS received 180 RINGING from SIP
                  * @param call
                  */
                @Override
                public void onRing(final Call call) {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            mCallStatus.setText("Call: " + call.getStatus());
                        }
                    });
                }

                /**
                  * Call is set on hold by the remote participant
                  * @param call
                  */
                @Override
                public void onHold(final Call call) {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            mCallStatus.setText("Call: " + call.getStatus());
                        }
                    });
                }

                /**
                  * Call is established. WCS received 200 OK from SIP on INVITE.
                  * @param call
                  */
                @Override
                public void onEstablished(final Call call) {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            mCallStatus.setText("Call: " + call.getStatus());
                        }
                    });
                }

                /**
                  * Call is terminated either by caller or by a SIP remote participant.
                  * @param call
                  */
                @Override
                public void onFinished(final Call call) {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            mCallButton.setText(R.string.action_call);
                            mCallButton.setTag(R.string.action_call);
                            mCallButton.setEnabled(true);
                            mCallStatus.setText("Call: " + call.getStatus());
                        }
                    });
                }
            });

            ActivityCompat.requestPermissions(ClickToCallActivity.this,
                  new String[]{Manifest.permission.RECORD_AUDIO},
                  CALL_REQUEST_CODE);

            SharedPreferences sharedPref = ClickToCallActivity.this.getPreferences(Context.MODE_PRIVATE);
            SharedPreferences.Editor editor = sharedPref.edit();
            editor.putString("callee", mCalleeView.getText().toString());
            editor.apply();
        }
    });
}

case CALL_REQUEST_CODE: {
    if (grantResults.length == 0 ||
          grantResults[0] != PackageManager.PERMISSION_GRANTED) {
        mCallButton.setEnabled(false);
        session.disconnect();
        Log.i(TAG, "Permission has been denied by user");
    } else {
        /**
          * Make the outgoing call
          */
        call.call();
        Log.i(TAG, "Permission has been granted by user");
    }
}

mCallButton.setEnabled(false);
session.disconnect();

@Override
public void onDisconnection(final Connection connection) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            mCallButton.setText(R.string.action_call);
            mCallButton.setTag(R.string.action_call);
            mCallButton.setEnabled(true);
            mCallStatus.setText("Connection: " + connection.getStatus());
        }
    });
}