Shell Server Mode
Web manager is chiefly used to configure the IP Office service which provide telephony features such as users, extensions and lines.
The IP Office Application Server or UCM module do not provide telephony features. However, those servers still host a version of IP Office service that provides some options, mainly related to security and IP routing settings, necessary to connect with the full IP Office service on other servers. This minimal IP Office service is referred to as a "shell server" mode.