How to make SIP phone work from PC LAN?

Question

SIP

Dear masters and gurus!

There is a D-Link DPH 150S VoIP device, everything is set up well, if you connect it directly to the router, it works and calls.
If we insert it not into the router (it is far away) but into the PC port, then it immediately writes that registration on the network is required.

How to make a PC port so that it connects to the network from it. The PC itself is on a Wi-Fi network.