1.) Unzip/Extract the file.
2.) Double-click OSSPhone_plugin_installer.pkg
*This should automatically install the necessary components for the plugin
3.) Start Spark.
4.) OSSPhone will display a notification that the plugin has successfully initialized.
5.) You may now use the plugin to make your calls.
*Remember to set the Softphone Configuration.

**Tested on Mac OS X 10.4.11; Spark 2.5.8