code: @Override
  	public String sendFAX(String corpNum, String sendNum, Receiver[] receivers,
  			File file, Date reserveDT) throws PopbillException {
  
  		return requestFax(corpNum, sendNum, null, receivers, new File[]{file}, 
  				reserveDT, null, null, null, null);
  	}
docs: /*
  (non-Javadoc)
  @see com.popbill.api.FaxService#sendFAX(java.lang.String, java.lang.String, com.popbill.api.fax.Receiver[], java.io.File, java.util.Date)