After an IP phone has been added to a Cisco Unified Communications Manager server, the
administrator notices that the phone has a directory number that is not in the number range in use
by the organization. He also notes that the directory number is 1000. What is the most likely
cause?

A.
The phone number was misconfigured.

B.
The phone may have auto-registered.

C.
The phone is configured on another server.

D.
DHCP gave the phone the wrong directory number

E.
TFTP server is misconfigured

Explanation:
Organizations have multiple server which work as a single cluster.
Link:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmebasic.htm
l#wp1013086