The phone has no dial tone
It mean the phone is not ready to initiate call. Phone is not ready because it can't register to upstream VoIP provider.Based on your observation, phone have no IP address. Although I know no details of your home LAN, in most typical scenario the IP address is assigned to phone by a router via DHCP protocol.
Phone is configured to use DHCP by default, so no configuration of phone is necessary (unless you already changed settings to something wrong). Thus it's about router - it needs to be configured to assign addresses via DHCP.Nut most home routers have configured it by default. So it may be just incorrect wiring.
So much uncertainty.
Ask your LAN administrator or nearest network guru for help. Proper wiring needs to be verified. Not every Ethernet plug on the router can be used. Proper configuration of router needs to be verified. Unless IP address will be assigned to phone, you can't continue.