I think this used to be the link
http://www.freepbx.org/support/documentation/howtos/howto-linksys-spa-3102-sipura-spa-3000-freepbx
I am very sad over this. I have used this guide many times. The SPA3102 has very obscure configurations that only this FreePBX article went into detail about
If anyone can repost it that would be cool!
I use SPA3102s for various purposes, currently setting up SIP Trunk for my $3/month MagicJack FXO phone line to FreePBX for the house phone and testing new VoIP things
thanks