Server side
OS debain 9 & also Should support Cent os 7.X
install asterisk
install openvpn
install Monast
Ass Sip clien to send traffic , that traffic should push to client side using prefix
client Side
OS debain 9 & also Should support Cent os 7.X
install asterisk
install OPENVPN
Install Chen_Mobile
Connect Server With iax to optimise bandwith
Register gateway