code: public OvhPcsFile billingAccount_voicemail_serviceName_directories_id_download_GET(String billingAccount, String serviceName, Long id, OvhServiceVoicemailAudioFormatEnum format) throws IOException {
  		String qPath = "/telephony/{billingAccount}/voicemail/{serviceName}/directories/{id}/download";
  		StringBuilder sb = path(qPath, billingAccount, serviceName, id);
  		query(sb, "format", format);
  		String resp = exec(qPath, "GET", sb.toString(), null);
  		return convertTo(resp, OvhPcsFile.class);
  	}
docs: Get a url to download the sound file
  
  REST: GET /telephony/{billingAccount}/voicemail/{serviceName}/directories/{id}/download
  @param format [required] File format wanted
  @param billingAccount [required] The name of your billingAccount
  @param serviceName [required]
  @param id [required] Id of the object