-= Info about application 'Record' =- 

[Synopsis]:
Record to a file

[Description]:
  Record(filename:format|silence[|maxduration][|option])

Records from the channel into a given filename. If the file exists it will
be overwritten.
- 'format' is the format of the file type to be recorded (wav, gsm, etc).
- 'silence' is the number of seconds of silence to allow before returning.
- 'maxduration' is the maximum recording duration in seconds. If missing
or 0 there is no maximum.
- 'option' may be 'skip' to return immediately if the line is not up,
or 'noanswer' to attempt to record even if the line is not up.

If filename contains '%d', these characters will be replaced with a number
incremented by one each time the file is recorded. 

Formats: g723, g729, gsm, h263, ulaw, alaw, vox, wav, WAV

User can press '#' to terminate the recording and continue to the next priority.

Returns -1 when the user hangs up.