You can automatically add phones to the Cisco CallManager database by using
auto-registration, manually add phones by using the phone configuration
windows, or add phones in groups with the Cisco Bulk Administration Tool
(BAT). By enabling auto-registration, you can automatically add a Cisco IP Phone
to the Cisco CallManager database when you connect the phone to your IP
telephony network. During auto-registration, Cisco CallManager assigns the next
available sequential directory number to the phone. In many cases, you might not
want to use auto-registration; for example, if you want to assign a specific
directory number to a phone. If you do not use auto-registration, you must
manually add phones to the Cisco CallManager database or use BAT. BAT, a
plug-in application, makes it possible for system administrators to perform batch
add, modify, and delete operations on large numbers of Cisco IP Phones. Refer to
the Bulk Administration Tool Guide for Cisco CallManager for detailed
instructions on using BAT.

After you add a Cisco IP Phone to Cisco CallManager Administration, the RIS
Data Collector service displays the device name, registration status, and the IP
address of the Cisco CallManager to which the phone is registered in the Phone
Configuration window.