code: public ArrayList<Long> billingAccount_voicemail_serviceName_directories_GET(String billingAccount, String serviceName, OvhVoicemailMessageFolderDirectoryEnum dir) throws IOException {
  		String qPath = "/telephony/{billingAccount}/voicemail/{serviceName}/directories";
  		StringBuilder sb = path(qPath, billingAccount, serviceName);
  		query(sb, "dir", dir);
  		String resp = exec(qPath, "GET", sb.toString(), null);
  		return convertTo(resp, t2);
  	}
docs: Voicemail directory messages
  
  REST: GET /telephony/{billingAccount}/voicemail/{serviceName}/directories
  @param dir [required] Filter the value of dir property (=)
  @param billingAccount [required] The name of your billingAccount
  @param serviceName [required]