//Initialize framework with application credentials
    QBSettings.getInstance().init(getApplicationContext(), APP_ID, AUTH_KEY, AUTH_SECRET);
    QBSettings.getInstance().setAccountKey(ACCOUNT_KEY);

    //Create session, sign in user and set QBChatService up
    String login = "login";
    String password = "password";

    final QBUser user = new QBUser(login, password);
    QBUsers.signUp(user).performAsync(new QBEntityCallback<QBUser>() {
        @Override
        public void onSuccess(QBUser user, Bundle args) {
            // success
        }

        @Override
        public void onError(QBResponseException error) {
            // error
        }
    });

    // Login
    QBUsers.signIn(user).performAsync( new QBEntityCallback<QBUser>() {
        @Override
        public void onSuccess(QBUser user, Bundle args) {
            // success
        }

        @Override
        public void onError(QBResponseException error) {
            // error
        }
    });

    //Add signalling manager
    QBChatService.getInstance().getVideoChatWebRTCSignalingManager()
            .addSignalingManagerListener(new QBVideoChatSignalingManagerListener() {
                @Override
                public void signalingCreated(QBSignaling qbSignaling, boolean createdLocally) {
                    if (!createdLocally) {
                        QBRTCClient.getInstance(getApplicationContext()).addSignaling((QBWebRTCSignaling) qbSignaling);
                    }
                }
            });

    QBRTCClient.getInstance(this).prepareToProcessCalls();