After using Voxilla's SPA3102 Configuration tool I've decide to create a guide on how to do it manually. It may look a bit lengthy but it is fairly simple when you get done with it
It is located here
Vegas baby, Vegas ...: Linksys SPA3102 setup with Trixbox
This guide might also work for other SPA units like SPA-2002 or
SPA-3000
Feel free to post comments.
Thank you