So I’ve setup a FreePBX server in a secure datacentre sat on a 1gb internet connection. So far I’ve blocked all ports on the firewall except for allowing VPN traffic through. I plan to have around 500 phones using VPN to connect to the server from around around 15 sites all with a static external IP
Should i do away with the VPN and use the FreePBX firewall to only allow traffic from those 15 external IP’s or should i continue to get each handset to VPN into the PBX?
I’m guessing using a VPN will increase the bandwidth needed over a simple SIP?
For the few phones that are roaming i would use VPN on these. Which option do you believe could work best?