default boolean call(final String from, final String to, final String message) throws Throwable {
        return false;
    }
Call.

@param from    the from
@param to      the to
@param message the message
@return true/false
@throws Throwable the throwable
core/cas-server-core-notifications-api/src/main/java/org/apereo/cas/notifications/call/PhoneCallOperator.java