.. _user_authentication:

User Authentication
-------------------

When logging in to the user interfaces, the credentials of the user can be
authenticated based on user credentials in:

* The internal system database
* An LDAP-based external authentication server
* A SAML-based identity management server

Administrator users are users that are able to log in to the administrator interface.
Presence of an administrator interface means that a system user instance exists.

Subscribers are system users that have, and are linked to, user accounts in one
or more UC applications. Subscriber management supports the management of UC
application user accounts that in turn may also be configured for local, LDAP or
SAML authentication.

API users are system users that connect directly to VOSS-4-UC using the API. The
system controls access to its service through HTTP basic authentication.