[This is preliminary documentation and subject to change.]
| Common-Name=International-ISDN-Number | Admin-Display-Name=International-ISDN-Number |
| Admin-Description=International-ISDN-Number | Object-Class=Attribute-Schema |
| Attribute-ID=2.5.4.25 | OM-Syntax=18 |
| Attribute-Syntax=String(Numeric) | LDAP-Display-Name=internationalISDNNumber |
| Multi-valued | System-Only=FALSE |
| Mapi-ID=\x80BE | |
| Range 1 to 16 | |
| Schema-ID-GUID={bf96798d-0de6-11d0-a285-00aa003049e2} | Comment=used by Exchange |