[Asterisk-Users] How to connect two Asterisks as secure as possible without too much additional bandwidth ?

[Robert Rozman]

Hi,

I plan to connect to remote Asterisk that will terminate calls to ISDN
primary channel. I'd certainly like to secure this type of service, so would
kindly ask for any advice on how to secure this authentication as much as
reasonably possible.

Since there is long IP route I guess VPN will take too much additional
bandwidth...

Regards,

Robert.