What should the engineer do to restore the phone to service?
An IP phone that is using PoE shows “unknown” in Cisco Unified Communications Manager. What should the engineer do to restore the phone to service?
A. restart the phone from Cisco Unified Communications Manager
B. reset the phone from Cisco Unified Communications Manager
C. enter **# locally on the IP phone
D. check the network cable and switch port
Correct Answer: D