| Attribute | Must | Description |
|---|---|---|
| Business-Category | ||
| Destination-Indicator | ||
| Facsimile-Telephone-Number | ||
| International-ISDN-Number | ||
| Locality-Name | ||
| Organizational-Unit-Name | X | In subclass Messaging-Domain, contains the domainname. |
| Physical-Delivery-Office-Name | ||
| Post-Office-Box | ||
| Postal-Address | ||
| Postal-Code | ||
| Preferred-Delivery-Method | ||
| Registered-Address | ||
| Search-Guide | ||
| See-Also | ||
| State-Or-Province-Name | ||
| Street-Address | ||
| Telephone-Number | ||
| Teletex-Terminal-Identifier | ||
| Telex-Number | ||
| User-Password | ||
| X121-Address |