This site is being put together to store documentation I write up so that when I complete projects, or attempt to do projects again, I won't have to relearn all the stuff I learned the first time.
Notes from my latest setup using a Sangoma A200 card with 4 FXO modules, trixbox 2.6.2.3, Grandstream GXP-2000s for phones, and using Endpoint manager to configure them.
This is borrowed from http://www.databrokers.net/opensource/ipcop/vpn-to-vpn-detailed-how-to.html
All credit goes to him, I'm mirroring because I don't use this information often, but I have a little fear that some day I might not be able to find it when I need it.