D-Link DVX-2000MS-10P - VoiceCenter IP Phone Sys 10P Quick Installation Manual page 4

Connecting the DPH-125MS IP Phones
Plug the power adapter into an AC outlet or power strip and plug the
other end into the AC input on the DHP-125MS IP Phone. The Power
LEDs will light up to indicate proper connection.
Connect one end of the Ethernet cable to the LAN port on the IP
Phone and connect the other end of the Ethernet cable to your Local
Area Network using a hub or switch. Repeats steps for additional
DPH-125MS IP Phones.
When you have connected the IP Phones to your network it should
look like the diagram below.
D-Link VoiceCenter Quick Install Guide