title: How can I convert MP3 files contained in the directory to ULAW files or any other raw format?
body: <p>I am working on asterisk server which uses ulaw files to play the IVR on the call but our customers provide only mp3 files which need to be converted into ulaw, since I am new to this thing and am not aware of any such programs as well is there any way to achieve this in a faster way?</p>
  
  <p>Thank You!!</p>