default boolean isCommunicationChannelAvailable() {
        return isMailSenderDefined() || isSmsSenderDefined() || isPhoneOperatorDefined() || isNotificationSenderDefined();
    }
Is communication channel available.

@return true or false
core/cas-server-core-notifications-api/src/main/java/org/apereo/cas/notifications/CommunicationsManager.java