# Call Internal Service

## Contents
Overview

## Overview
The Call Internal Service filter is a special filter that passes messages to an internal Servlet Application that has been deployed at the Enterprise Gateway. The appropriate application is selected based on the relative path on which the request message was received. The filter is used by Management Services that are configured to listen on the Management Interface on port 8090. For more information on how the Call Internal Service filter is used by these services, see the section on Management Services in the Configuring HTTP Services topic.