+Logger
+======
+Logger handle react on events like incoming or outgoing calls,
+if they start or finish, or on any data received from the ISDN bus.
+
+Available logger:
+
+CallDb
+ Log calls in a SQL database
+CallDreambox
+ Send messages on incoming calls to the DreamBox satellite
+ receiver
+CallEcho
+ Log to the command line. Helpful for debugging.
+CallFile
+ Log finished calls into a text file
+CallFileTop
+ Log finished calls into a text file, newest on top
+CallNotifySend
+ Use the unix ``notify-send`` command on starting and finished calls
+CallSendXmpp
+ Send an XMPP headline message for incoming calls to one or multiple
+ users.