I would like to set up a test lab for the purpose of learning and experimenting with SIP and SS7. I would like to use F-links. Please visit the following graphic representation to get a better idea on what I'd like to do: http://st100.startlogic.com/~novirusa/misc/sip-ss7.gif Neither configuration will have access to the internet or the PSTN. If this is doable, what would be the most economical hardware to use and what software would I need to install? I appreciaate your responses. Ray __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com