Hi Maciej,

Cisco Unified CME automatically creates a local phone directory consisting of the telephone numbers and names that are entered during ephone-dn configuration. Additional directory entries can be made by administrators using the directory entry command. Phone number directory listings are displayed in the order in which they are entered.

A single entry can be removed using the "no directory entry directory-tag" command.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/command/reference/cme_d1ht.html#wp1012296

Hope this helps!

Rob