By default Cisco CUCM 10 includes a system partition called “Directory URI”. All SIP URIs are placed into this partition automatically.

As this is a system partition, it cannot be removed from the system, however you can specify another partition where all SIP URIs can be automatically placed into.

System -> Enterprise Parameters -> Directory URI Alias Partition. Drop the menu down and select a partition you would like the SIP URIs to be placed into.

As you can see I have selected the partition called INTERNAL_PT for my SIP URIs.