Apart from installing the Megaphone 1.0.3P application, the installer also installs the following files in your System Folder:
Control Panels -> Telephone Setup (version 1.0.1)
Extensions -> CRC TelePort TelTool (version 2.1)
Launcher Items -> Megaphone (alias)
The Megaphone 1.0.3P Updater does not install a new Telephone Manager extension in the Extensions Folder.
Note: Depending on your Performa, some lower-level extensions may not change. For example, Telephone Setup does not change if the Update is installed on a Performa 6300, but it will change if installed on a Performa 5215.