Just something interesting.
I just installed a Vosky system on our 3300 using analog LS trunks.
It is a PBX to Skype gateway that allows you to Make and Receive calls via Skype.
You can call Skype clients, Skype clients can call in. If you pay Sky $30/ year you can program your pbx to route all US and Canada calls out the Skype trunks. So for $30 per year per line you slice your call cost per minute to $0.00
I had a bit of an issue setting it up, but the Vosky folks were good to work with and once I got an engineer on line that could point out some very low level settings, things work good.
You can see their site at
www.Vosky.comRalph