I posted Blue Box Podcast #56 tonight and with it Jonathan and I are beginning a series of mini-tutorials on subjects related to VoIP security. In this show, we talked about voice encryption. In the next show (already recorded) we will talk about signaling encryption. The idea is to cover some basic ground so that people not familiar with the area can have a basic understanding.
Just glad to get that one up - tomorrow I'm going to work on #57 to see if I can get it online for Wednesday. We're trying hard to get back on a weekly schedule. (#56 was intended to go up last week.)