How to set up a proxy server for SIP telephony on win-serv 2012?

Question

proxy

Good afternoon, dear ones. It is necessary to raise a proxy server on windows server 2012r2 in order for Jitsi (Pidgin) installed on other PCs to work through it. Through what software is this done? And how to set everything up correctly? which IP addresses and ports to choose? Traffic should go through the connection raised on the VPN server.