How to create site to site on openvpn between two mikrotik or between microtik+pfsense?

Question

openvpn

Please give a working instruction AND so that ip phones connected to routers work

Answer 1

1. Set up a vpn tunnel between mikrotiks
2. Set up routing in both networks for the passage of voice traffic
Both points are easily googled. A toaster is not a place to "give instructions".