User Manager/Active sessions

When a session is started it's state is active. It can become inactive in one of the following ways:

• User Manager receives accounting-stop message;
• Customer closes session manually in the web interface;
• An active session is closed when the same router asks to start a new session with the same accounting-session-id.

If the router hasn't sent accounting-stop message the session may remain active even if it's closed already long time ago. Such sessions can be closed manually.