Hello,
I propose a proven and flexible solution - installation and configuration of a multi-protocol VPN server (server management via an app or a cli) in a network with a SIP server. Installing and configuring a VPN client on users' PCs, configuring routing, configuring a preferred SIP softphone client. This solution has been tested and now working for Windows, Linux, MAC, and smartphones. Please, all details in PM chat. Well, of course, all the documentation about adding and setting up new clients.
Regards,
Eugenij.