What could be the cause of this issue?

A new phone has been added to the Cisco Unified Communications Manager server. The phone
display shows Your Current Options, but when the New Call softkey is pressed, no dial tone is
heard and the call cannot be placed. What could be the cause of this issue?

A.
An incorrect MAC address has been entered for the new phone.

B.
No directory number has been assigned to a line.

C.
The end user is not associated with the device.

D.
No calling search space has been configured on the line.

E.
An incorrect device pool has been configured on the phone.

Explanation:

A Cisco Unified CME system uses the following basic building blocks:
• Ephone or voice register pool – A software concept that usually represents a physical telephone,
although it is also used to represent a port that connects to a voice-mail system, and provides the

ability to configure a physical phone using Cisco IOS software. Each phone can have multiple
extensions associated with it and a single extension can be assigned to multiple phones.
Maximum number of ephones and voice register pools supported in a Cisco Unified CME system
is equal to the maximum number of physical phones that can be connected to the system.
• Directory number – A software concept that represents the line that connects a voice channel to a
phone. A directory number represents a virtual voice port in the Cisco Unified CME system, so the
maximum number of directory numbers supported in Cisco Unified CME is the maximum number
of simultaneous call connections that can occur. This concept is different from the maximum
number of physical lines in a traditional telephony system.
Link:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmeover.html