return convertEmptyToNull(surname);
    }

    public void setSurname(String value) {
        registerModifiedProperty("surname");
        this.surname = value;
    }

    public String getTelephoneNumber() {
        checkSpecifiedProperty("telephoneNumber");
        return convertEmptyToNull(telephoneNumber);
    }

    public void setTelephoneNumber(String value) {

        setupEpg(_epgMap, et -> ((User) et).getSurname(), (et, vl) -> ((User) et).setSurname(DfTypeUtil.toString(vl)), "surname");
        setupEpg(_epgMap, et -> ((User) et).getTelephoneNumber(), (et, vl) -> ((User) et).setTelephoneNumber(DfTypeUtil.toString(vl)),
                "telephoneNumber");
        setupEpg(_epgMap, et -> ((User) et).getTeletexTerminalIdentifier(),

    }

    @Test
    public void test_user_telephoneNumber() {
        final User user = new User();
        assertNull(user.getTelephoneNumber());

        user.setTelephoneNumber("123-456-7890");
        assertEquals("123-456-7890", user.getTelephoneNumber());
    }

    @Test
    public void test_user_homePhone() {
        final User user = new User();
        assertNull(user.getHomePhone());

                        .forEach(v -> modifyDeleteEntry(modifyList, attrEmployeeNumber, v)));
        final String attrTelephoneNumber = fessConfig.getLdapAttrTelephoneNumber();
        OptionalUtil.ofNullable(user.getTelephoneNumber())
                .filter(StringUtil::isNotBlank)
                .ifPresent(s -> modifyReplaceEntry(modifyList, attrTelephoneNumber, s))