in ISDN (D channel).
X.500 ITU-T standards that cover user directory services, see LDAP. Ex-
ample: The phone book is the directory in which you find people on
the basis of their name (agreement with the telephone directory).
The Internet supports several databases with information on users,
such as e-mail addresses, telephone numbers and postal ad-
dresses. You can search these databases to obtain information
about individuals.
X.509 ITU-T standards that define the format of the certificates and certific-
ate queries and their use.
Glossary Funkwerk Enterprise Communications GmbH
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