code: public static void validateFaxJobID(String faxJobID)
      {
          if((faxJobID==null)||(faxJobID.length()==0))
          {
              throw new FaxException("Fax job ID not provided.");
          }
          int faxJobIDInt=Integer.parseInt(faxJobID);
          WindowsFaxClientSpiHelper.validateFaxJobID(faxJobIDInt);
      }
docs: This function validates the provided fax job ID (not checking
  fax server, only format).
  In case of an invalid ID, an error will be thrown.
  
  @param   faxJobID
  The fax job ID to validate