An administrator is attempting to add a new IP phone to the network. The phone does not register
and continues to cycle through the registration process. The administrator checks and notices that
the IP address assigned to the phone is not in the correct network. What is the cause of this
issue?

A.
The TFTP server is misconfigured.

B.
The DHCP server is giving out false IP addresses.

C.
The Cisco Unified Communications Manager is down.

D.
The switch port that the phone is connected to is configured with the wrong voice VLAN.

E.
The PSTN gateway is down.

Explanation: