Hi Edil,
Can you please check the Phone Configuration Page for this phone via ccmadmin. Make sure that it doesn't have something set under the Directory url;
Cisco IP Phone - External Data Locations (leave blank to use default)
Information
Directory http://blah/CCMCIP/xmldirectory.asp
This setting on the device will override the default url for directories.
Fixing Issues with Corporate Directory Lookup from the Cisco IP Phone
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a008009463a.shtml
Let us know,
Rob
