Gluball-erlang is a project mainly written in Erlang, it's free.
test
sudo apt-get install yaws # This is the yaws webserver, written in erlang, which supports native erlang code in webpages. replace index.html in /usr/share/yaws with index.yaws compile db.erl as : sudo erl db.erl place db.beam in /usr/lib/erlang/lib/yaws-1.84/ebin
run yaws -sname nodename
on the shell, type : mnesia:create_schema([nodename]).
mnesia:start().
db:insert("username", "password").
db:insert("username", "password").
db:insert("username", "password").
db:insert("username", "password").
db:insert("username", "password").
Now, when FS makes a request with sip_auth_username=username&domain=adsfadf, then it will get back password="password" :