NONE is when do not want access to the media. Typically, you want to share the control of a hard phone. You can monitor all messages going to/from the phone and inject messages (e.g., go off hook, push a button).

Selecting TELECOMMUTER mode allows you to redirect the media to any device that has a phone number (e.g., cell phone). You can monitor all messages going to/from the phone and inject messages (e.g., go off hook, push a button). However, you have no access to media itself.

Selecting SERVER_MODE mode allows you to register the phone directly on the server. The media will go to the server. You can monitor all messages going to/from the phone and inject messages (e.g., go off hook, push a button). However, you have no access to media itself. This mode will allow you to inject wav files into a call (as long as the wav files are stored on the server) and also to record calls.

Selecting CLIENT_MODE mode allows you to register the phone directly on the computer where the application is running. You can specify where the media is supposed to go. You can monitor all messages going to/from the phone and inject messages (e.g., go off hook, push a button). However, you have no access to media itself. Since the application has access to the media it can dop whatever it wants to with it.

UNDEFINED mode should never be used.