Which of the following is the FIRST action to try to resolve this problem?

A client reports that their VoIP phone screen displays duplicate IP address. Which of the
following is the FIRST action to try to resolve this problem?

A.
Change MAC address settings

B.
Call the vendor

C.
Try another LAN connection

D.
Reboot the phone

Explanation:

Reference:
http://community.spiceworks.com/topic/172610-avaya-voip-phones-randomly-rebooting