-= Info about application 'Playback' =- 

[Synopsis]:
Play a file

[Description]:
  Playback(filename[|option]):  Plays  back  a  given  filename (do not put
extension). 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. Returns -1 if the channel was hung up, or if the
file does not exist. Returns 0 otherwise.