Hi Romain,
Perhaps this is the info you are looking for;
Directory Services
Cisco DirSync
Unlike Windows versions of Cisco Unified CallManager, Cisco Unified CallManager 5.0 does not contain an embedded directory. Because of this change, the Cisco Unified CallManager database stores all user information. If you use an integrated corporate directory, for example, Microsoft Active Directory or Netscape/iPlanet Directory, with Cisco Unified CallManager, the Cisco DirSync service migrates the user data to the Cisco Unified CallManager database. The Cisco DirSync service does not synchronize the passwords from the corporate directory.
From this doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a008062b69a.html#wp1041069
The following list summarizes the changes in directory functionality from previous releases of Cisco CallManager:
The directory component has been decoupled from Cisco CallManager to ensure high Cisco CallManager availability independent of the corporate directory.
Cisco CallManager and related applications store all application data in the local database instead of in an embedded directory. The embedded directory gets removed and Cisco CallManager supports synchronization with the customer directory.
From this doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a008037e2d0.html#wp25298
Directory Access for Cisco IP Phones
XML-capable Cisco IP Phones (such as models 7940, 7960, and so on) can search a corporate LDAP directory when a user presses the Directories button on the phone. The IP phones use HyperText Transfer Protocol (HTTP) to send requests to a web server. The responses from the web server must contain some specific Extensible Markup Language (XML) objects that the phone can interpret and display. In the case of a corporate directory search, the web server operates as a proxy by receiving the request from the phone and translating it into an LDAP request, which is in turn sent to the corporate directory server. After being encapsulated in the appropriate XML objects, the response gets interpreted and sent back to the phone.
From this doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a008037e2d0.html#wp1066325
Hope this helps!
Rob
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