Abbreviated dialing is not available when transferring a call or doing Ad-Hoc conference. Fast dial is the best option to use.
The Configuring Personal Directory section of Release Notes for Cisco CallManager Release 4.1(3) explains how the administrator must set up the Personal Directory and Fast Dial services in Cisco CallManager.
The Cisco IP Phone Address Book Synchronizer can then be used, and users can subscribe to the service through the Cisco CallManager User pages.