Hi guys I have a project pbx ns500 In Company And 10 telephones ip
1-company in ns500
2-In each office 2 telephones ip nt511
Connect to vpn All offices 5 Sites
-What is the programming in pbx
-What programming in all router in offices
connect all to Virtual IP Extension
not connect h323

thanks to all guys

if VPN between all sites are setup, then they should work.

You should get someone in to help as you have a lot of different areas it could be failing, if you get in a Panasonic installer, this can be done without VPN's

This is technically above what is allowed to be discuss on this open forum