Hi Ricardo,
Maybe this will help;
Directed Call Park allows a user to transfer a parked call to an available user-selected directed call park number. Configure directed call park numbers in the Cisco Unified CallManager Directed Call Park Configuration window. Configured directed call park numbers exist cluster wide. You can configure phones that support the directed call park Busy Lamp Field (BLF) to monitor the busy/idle status of specific directed call park numbers. Users can also use the BLF to speed dial a directed call park number.
A user can retrieve a parked call by dialing a configured retrieval prefix followed by the directed call park number where the call is parked.
The is an excellent Configuration Checklist for Directed Call Park in this doc;
Directed Call Park
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a008070e557.html#wp1047581
Hope this helps!
Rob
PS: Directed call park system feature comes standard with Cisco Unified CallManager software. Any phone that can perform a transfer can use directed call park. It does not require special installation. Cisco recommends that you configure either call park or directed call park, but not both. If you do configure both, ensure that the directed call park and call park numbers do not overlap.
