Hi Vino,
There are a number of services and applications that are related to the User as created in the CCM Directory. Applications and Services That Use the Embedded LDAP Directory;
The following Cisco CallManager applications and services use the embedded LDAP directory for user and other types of information:
Bulk Administration Tool (BAT)
Tool for Auto-Registered Phone Support (TAPS)
AXL
Cisco CallManager Extension Mobility
Multi-Level Administration (MLA)
Cisco CallManager User Options
Cisco Conference Connection
CTIManager
CDR Analysis and Reporting (CAR)
Cisco IP Manager Assistant (IPMA)
Cisco Customer Response Solutions (CRS)
Personal Assistant
Cisco Emergency Responder (CER)
Cisco IP Phone Services
Personal Address Book (PAB)
**FastDials
Cisco WebDialer
Cisco IP SoftPhone
Cisco IP Communicator
Cisco CallManager Attendant Console
From this good doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a00803edaa5.html
Hope this helps!
Rob