@Bean
    @ConditionalOnMissingBean(name = PhoneCallOperator.BEAN_NAME)
    @RefreshScope(proxyMode = ScopedProxyMode.DEFAULT)
    public PhoneCallOperator phoneCallOperator(final CasConfigurationProperties casProperties) {
        return PhoneCallOperator.noOp();
    }
This is {@link CasCoreNotificationsAutoConfiguration}.

@author Misagh Moayyed
@since 5.0.0
core/cas-server-core-notifications/src/main/java/org/apereo/cas/config/CasCoreNotificationsAutoConfiguration.java