-= Info about application 'BackGround' =- 

[Synopsis]:
Play a file while awaiting extension

[Description]:
  Background(filename[|options[|langoverride]]): Plays a given file, while simultaneously
waiting for the user to begin typing an extension. The  timeouts do not
count until the last BackGround application has ended.
Options may also be  included following a pipe symbol. The 'skip'
option causes the playback of the message to  be  skipped  if  the  channel
is not in the 'up' state (i.e. it hasn't been  answered  yet. If 'skip' is 
specified, the application will return immediately should the channel not be
off hook.  Otherwise, unless 'noanswer' is specified, the channel channel will
be answered before the sound is played. Not all channels support playing
messages while still hook. The 'langoverride' may be a language to use for
playing the prompt which differs from the current language of the channel
Returns -1 if the channel was hung up, or if the file does not exist. 
Returns 0 otherwise.