title: mp3 to gsm for asterisk
body: <p>In our application we allow user to upload audio file. currently we support .<strong>wav</strong> format and we use "<strong>sox</strong>" to convert the .wav file to gsm for asterisk. We would like to have <strong>mp3</strong> support as well. Any recommendation on how to get this done ?</p>
  
  <p>Your help is highly appreciated. Thanks you.</p>