protected String formatBody(final String contents) {
        val sub = new StringSubstitutor(this.parameters, "${", "}");
        return sub.replace(contents);
    }
This is {@link PhoneCallBodyBuilder}.

@author Misagh Moayyed
@since 7.0.0
core/cas-server-core-notifications-api/src/main/java/org/apereo/cas/notifications/call/PhoneCallBodyBuilder.java