After my latest blog post, I had an initial setup running with the Linksys SPA 3000, Asterisk and the SLUG. However, I have been experiencing problems with the setup. If an incoming call through the SPA-3000 doesn't get answered, the PSTN Line seems to get stuck in the Ringing state. I have been experimenting with the Disconnect Tone settings, but to no avail so far. I will keep you posted on the progress!