Hi, I have 3cx system installed in HO and connected to 5 other branches. If the internet to HO is down, my all other 5 branch phones will be down. So I am planning to put a 2nd server in any other branch. Which is the best solution? High availability will work for me? Because if HO VPN down, all HO phones will work using HO 3CX server and other location phones will work with secondery server we kept in other office. But when VPN established, what will happen?