Jabber clients and enterprise organization framework

How can you configure your enterprise Jabber network so users don't need to input contacts at all; all the contacts are pre-configured by the background system and put to the front users to use?

User contacts can be managed programmatically using the Presence Client Configuration SOAP interface:

https://developer.cisco.com/site/im-and-presence/downloads/web_services_reference_app/

In some cases, modifying a user's roster via this API will not cause some Jabber clients to dynamically/immediately reflect the updates.  You can do that programmatically depending on the client software you're using.  For example, with Jabber IM SDK (CAXL), you would refresh the roster display.