}

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

    public void setTelephoneNumber(String value) {
        registerModifiedProperty("telephoneNumber");
        this.telephoneNumber = value;
    }

    public String getTeletexTerminalIdentifier() {

        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(),

            result.setStreet(DfTypeUtil.toString(source.get("street")));
            result.setSurname(DfTypeUtil.toString(source.get("surname")));
            result.setTelephoneNumber(DfTypeUtil.toString(source.get("telephoneNumber")));
            result.setTeletexTerminalIdentifier(DfTypeUtil.toString(source.get("teletexTerminalIdentifier")));

    }

    @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();

                setAttributeValue(result, fessConfig.getLdapAttrEmployeeNumber(), o -> user.setEmployeeNumber(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrTelephoneNumber(), o -> user.setTelephoneNumber(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrHomePhone(), o -> user.setHomePhone(o.toString()));