This small how-to describes the installation G.729 and G.723.1 codecs on Asterisk.
Recently i faced the problem of connecting two LANs using PPTP and an intermediate PPTP server. I had to use this approach because the network setup was such that none of the LAN routers (DD-WRT) could contact the other but both could contact an intermediate server.
Trying to run a second instance of Skype 4 for Linux and you just bring your running instance in the foreground? Here is how to do it.